Reservoir characteristics and genetic differences between the second and fourth members of Sinian Dengying Formation in northern Sichuan Basin and its surrounding areas
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摘要
This study investigated the characteristics and genesis of reservoirs in the 2~(nd) and 4~(th) members of Sinian Dengying Formation in northern Sichuan and its surrounding areas, on the basis of outcrop, drilling cores and thin section observation and geochemical analysis. The reservoirs of 2~(nd) member are distributed in the middle part of the stratum. The reservoir quality is controlled by supergene karst and the distribution of mound-shoal complex. The bedded elongated isolated algal framework solution-cave and the residual "grape-lace" cave, which are partially filled with multi-stage dolosparite, constituted the main reservoir space of the 2~(nd) member. There is no asphalt distribution in the pores. The pore connectivity is poor, and the porosity and permeability of the reservoir is relatively low. The reservoirs of 4~(th) member were distributed in the upper and top part of the stratum. The reservoir quality is controlled by burial dissolution and the distribution of mound-shoal complex. The bedded algal framework solution-pores or caves, intercrystalline pores and intercrystalline dissolved pores constituted the main reservoir space of the 4~(th) member. It's partially filled with asphalt and quartz, without any dolosparite fillings in the pores and caves. The pore connectivity is good. Most of the 4~(th) member reservoirs had medium-low porosity and low permeability, and, locally, medium-high porosity and medium permeability. Affected by the development of mound-shoal complex and heterogeneous dissolution, the platform margin along Ningqiang, Guangyuan, Jiange and Langzhong is the most favorable region for reservoir development. Deep buried Dengying Formation in the guangyuan and langzhong areas should be the most important hydrocarbon target for the future exploration.
This study investigated the characteristics and genesis of reservoirs in the 2~(nd) and 4~(th) members of Sinian Dengying Formation in northern Sichuan and its surrounding areas, on the basis of outcrop, drilling cores and thin section observation and geochemical analysis. The reservoirs of 2~(nd) member are distributed in the middle part of the stratum. The reservoir quality is controlled by supergene karst and the distribution of mound-shoal complex. The bedded elongated isolated algal framework solution-cave and the residual "grape-lace" cave, which are partially filled with multi-stage dolosparite, constituted the main reservoir space of the 2~(nd) member. There is no asphalt distribution in the pores. The pore connectivity is poor, and the porosity and permeability of the reservoir is relatively low. The reservoirs of 4~(th) member were distributed in the upper and top part of the stratum. The reservoir quality is controlled by burial dissolution and the distribution of mound-shoal complex. The bedded algal framework solution-pores or caves, intercrystalline pores and intercrystalline dissolved pores constituted the main reservoir space of the 4~(th) member. It's partially filled with asphalt and quartz, without any dolosparite fillings in the pores and caves. The pore connectivity is good. Most of the 4~(th) member reservoirs had medium-low porosity and low permeability, and, locally, medium-high porosity and medium permeability. Affected by the development of mound-shoal complex and heterogeneous dissolution, the platform margin along Ningqiang, Guangyuan, Jiange and Langzhong is the most favorable region for reservoir development. Deep buried Dengying Formation in the guangyuan and langzhong areas should be the most important hydrocarbon target for the future exploration.
This study investigated the characteristics and genesis of reservoirs in the 2~(nd) and 4~(th) members of Sinian Dengying Formation in northern Sichuan and its surrounding areas, on the basis of outcrop, drilling cores and thin section observation and geochemical analysis. The reservoirs of 2~(nd) member are distributed in the middle part of the stratum. The reservoir quality is controlled by supergene karst and the distribution of mound-shoal complex. The bedded elongated isolated algal framework solution-cave and the residual "grape-lace" cave, which are partially filled with multi-stage dolosparite, constituted the main reservoir space of the 2~(nd) member. There is no asphalt distribution in the pores. The pore connectivity is poor, and the porosity and permeability of the reservoir is relatively low. The reservoirs of 4~(th) member were distributed in the upper and top part of the stratum. The reservoir quality is controlled by burial dissolution and the distribution of mound-shoal complex. The bedded algal framework solution-pores or caves, intercrystalline pores and intercrystalline dissolved pores constituted the main reservoir space of the 4~(th) member. It's partially filled with asphalt and quartz, without any dolosparite fillings in the pores and caves. The pore connectivity is good. Most of the 4~(th) member reservoirs had medium-low porosity and low permeability, and, locally, medium-high porosity and medium permeability. Affected by the development of mound-shoal complex and heterogeneous dissolution, the platform margin along Ningqiang, Guangyuan, Jiange and Langzhong is the most favorable region for reservoir development. Deep buried Dengying Formation in the guangyuan and langzhong areas should be the most important hydrocarbon target for the future exploration.
引文
[1]WEI Guoqi,SHEN Ping,YANG Wei,et al.Formation conditions and exploration prospects of Sinian large gas fields,Sichuan Basin.Petroleum Exploration and Development,2013,40(2):129-138.
[2]XU Chunchun,SHEN Ping,YANG Yueming,et al.Accumulation conditions and enrichment patterns of natural gas in the Lower Cambrian Longwangmiao Fm reservoirs of the Leshan-Longnüsi Paleohigh,Sichuan Basin.Natural Gas Industry,2014,34(3):1-7.-
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[6]CHEN Yana,SHEN Anjiang,Pan Liyin,et al.Origin and distribution of microbial dolomite reservoirs:A case study of 4th Member of Sinian Dengying Formation in the Sichuan Basin,SW China.Petroleum Exploration and Development,2017,44(5):704-715.
[7]SONG Jinmin,LIU Shugen,Li Zhiwu,et al.Characteristics and controlling factors of microbial carbonate reservoirs in the Upper Sinian Dengying Formation in the Sichuan Basin,China.Oil&Gas Geology,2017,38(4):741-752.
[8]LI Yingqiang,HE Dengfa,WEN Zhu.Palaeogeography and tectonic-depositional environment evolution of the Late Sinian in Sichuan Basin and adjacent areas.Journal of Palaeogeography,2013,15(2):231-245.
[9]DENG Shenghui,FAN Ru,LI Xin,et al.Subdivision and correlation of the Sinian(Ediacaran)system in the Sichuan Basin and its adjacent area.Journal of Stratigraphy,2015,39(3):239-254.
[10]WEI Guoqi,YANG Wei,DU Jinhu,et al.Geological characteristics of the Sinian-Early Cambrian intracratonic rift,Sichuan Basin.Natural Gas Industry,2015,35(1):24-35.
[11]ZHONG Yong,LI Yalin,ZHANG Xiaobin,et al.Evolution characteristics of Central Sichuan palaeouplift and its relationship with Early Cambrian Mianyang-Changning intracratonic sag.Journal of Chengdu University of Technology(Science&Technology Edition),2014,41(6):703-712.
[12]ZHOU Jingao,ZHANG Jianyong,DENG Hongying,et al.Lithofacies paleogeography and sedimentary model of Sinian Dengying Fm in the Sichuan Basin.Natural Gas Industry,2017,37(1):24-31.
[13]ZHANG Yinben.Origin of the grape-like texture in rocks of Sinian age.Petroleum Geology&Expeximent,1980,2(4):40-43.
[14]WANG Xingzhi,HUANG Jixiang,HOU Fanghao,et al.The relations between paleokarst and reservoir porosity in Dengying Formation,Sinian of Ziyang and neighboring area,Sichuan.Journal of Mineralogy and Petrology,1996,16(2):47-54.
[15]SHI Zejin,LIANG Ping,WANG Yong,et al.Geochemical characteristics and genesis of grapestone in Sinian Dengying Formation in south-eastern Sichuan Basin.Acta Petrologica Sinica,2011,27(8):2263-2271.
[16]HAO Yi,ZHOU Jingao,CHEN Xu,et al.Genesis and geological significance of upper Sinian Dengying dolostone with grape-lace shaped cement,Sichuan Basin.Marine Origin Petroleum Geology,2015,20(4):57-64.
[17]WANG Xingzhi,HOU Fanghao,LIU Zhongxuan.Stratified dolomite reservoirs in Dengying Formation of Ziyang Region.Petroleum Exploration and Development,1997,24(2):37-40.
[18]ZHAO Xuefeng,ZHU Guangyou,LIU Qinfu,et al.Main control factors of pore development in deep marine carbonate reservoirs.Natural Gas Geoscience,2007,18(4):514-521.
[19]JIN Z,ZHU D,HU W,et al.Mesogenetic dissolution of the middle Ordovician limestone in the Tahe oilfield of Tarim basin,NW China.Marine&Petroleum Geology,2009,26(6):753-763.
[20]JIN Zhenkui,YU Kuanhong.Characteristics and significance of the burial dissolution of dolomite reservoirs:Taking the Lower Paleozoic in eastern Tarim Basin as an example.Petroleum Exploration and Development,2011,38(4):428-434.
[21]LEI Chuan,CHEN Honghan,SU Ao,et al.Study progress on buried dissolution in carbonate rock.Fault-Block Oil&Gas Field,2014,21(2):165-170.
[22]SHEN Anjiang,SHE Min,HU Anping,et al.Scale and distribution of marine carbonate burial dissolutional pores.Natural Gas Geoscience,2015,26(10):1823-1830
[23]MAZZULLO S J.Overview of porosity evolution in carbonate reservoirs.Kansas Geological Society Bulletin,2004,79:20-28.
[24]SHE Min,SHOU Jianfeng,SHEN Anjiang,et al.Experimental simulation of dissolution and alteration of burial organic acid fluid on dolomite reservoir.Journal of China University of Petroleum(Natural Science Edition),2014,38(3):10-17.
[25]SONG Wenhai.Research on reservoir-formed conditions of largemedium gas fields of Leshan-Longnvsi palaeohigh.Natural Gas Industry,1996(S1):13-26.
[26]WEI Guoqi,WANG Zhihong,LI Jian,et al.Characteristics of source rocks,resource potential and exploration direction of Sinian and Cambrian in Sichuan Basin.Natural Gas Geoscience,2017,28(1):1-13.
[27]WEI Guoqi,YANG Wei,XIE Wuren,et al.Formation conditions,accumulation models and exploration direction of large gas fields in Sinian-Cambrian,Sichuan Basin.Natural Gas Geoscience,2015,26(5):785-795.
[28]TEINTURIER S,ELIE M,PIRONON J.Oil-cracking processes evidence from synthetic petroleum inclusions.Journal of Geochemical Exploration,2003,78(3):421-425.
[2]XU Chunchun,SHEN Ping,YANG Yueming,et al.Accumulation conditions and enrichment patterns of natural gas in the Lower Cambrian Longwangmiao Fm reservoirs of the Leshan-Longnüsi Paleohigh,Sichuan Basin.Natural Gas Industry,2014,34(3):1-7.-
[3]ZOU Caineng,DU Jinhu,XU Chunchun,et al.Formation,distribution,resource potential and discovery of the SinianCambrian giant gas field,Sichuan Basin,SW China.Petroleum Exploration and Development,2014,41(3):278-293.
[4]MO Jing,WANG Xingzhi,LENG Shengyuan,et al.Reservoir characteristics and control factors of Sinian Dengying Formation in central Sichuan.Geology in China,2013,40(5):1505-1514.
[5]LUO Bing,YANG Yueming,LUO Wenjun,et al.Controlling factors and distribution of reservoir development in Dengying Formation of paleo-uplift in central Sichuan Basin.Acta Petrolei Sinica,2015,36(4):416-426.
[6]CHEN Yana,SHEN Anjiang,Pan Liyin,et al.Origin and distribution of microbial dolomite reservoirs:A case study of 4th Member of Sinian Dengying Formation in the Sichuan Basin,SW China.Petroleum Exploration and Development,2017,44(5):704-715.
[7]SONG Jinmin,LIU Shugen,Li Zhiwu,et al.Characteristics and controlling factors of microbial carbonate reservoirs in the Upper Sinian Dengying Formation in the Sichuan Basin,China.Oil&Gas Geology,2017,38(4):741-752.
[8]LI Yingqiang,HE Dengfa,WEN Zhu.Palaeogeography and tectonic-depositional environment evolution of the Late Sinian in Sichuan Basin and adjacent areas.Journal of Palaeogeography,2013,15(2):231-245.
[9]DENG Shenghui,FAN Ru,LI Xin,et al.Subdivision and correlation of the Sinian(Ediacaran)system in the Sichuan Basin and its adjacent area.Journal of Stratigraphy,2015,39(3):239-254.
[10]WEI Guoqi,YANG Wei,DU Jinhu,et al.Geological characteristics of the Sinian-Early Cambrian intracratonic rift,Sichuan Basin.Natural Gas Industry,2015,35(1):24-35.
[11]ZHONG Yong,LI Yalin,ZHANG Xiaobin,et al.Evolution characteristics of Central Sichuan palaeouplift and its relationship with Early Cambrian Mianyang-Changning intracratonic sag.Journal of Chengdu University of Technology(Science&Technology Edition),2014,41(6):703-712.
[12]ZHOU Jingao,ZHANG Jianyong,DENG Hongying,et al.Lithofacies paleogeography and sedimentary model of Sinian Dengying Fm in the Sichuan Basin.Natural Gas Industry,2017,37(1):24-31.
[13]ZHANG Yinben.Origin of the grape-like texture in rocks of Sinian age.Petroleum Geology&Expeximent,1980,2(4):40-43.
[14]WANG Xingzhi,HUANG Jixiang,HOU Fanghao,et al.The relations between paleokarst and reservoir porosity in Dengying Formation,Sinian of Ziyang and neighboring area,Sichuan.Journal of Mineralogy and Petrology,1996,16(2):47-54.
[15]SHI Zejin,LIANG Ping,WANG Yong,et al.Geochemical characteristics and genesis of grapestone in Sinian Dengying Formation in south-eastern Sichuan Basin.Acta Petrologica Sinica,2011,27(8):2263-2271.
[16]HAO Yi,ZHOU Jingao,CHEN Xu,et al.Genesis and geological significance of upper Sinian Dengying dolostone with grape-lace shaped cement,Sichuan Basin.Marine Origin Petroleum Geology,2015,20(4):57-64.
[17]WANG Xingzhi,HOU Fanghao,LIU Zhongxuan.Stratified dolomite reservoirs in Dengying Formation of Ziyang Region.Petroleum Exploration and Development,1997,24(2):37-40.
[18]ZHAO Xuefeng,ZHU Guangyou,LIU Qinfu,et al.Main control factors of pore development in deep marine carbonate reservoirs.Natural Gas Geoscience,2007,18(4):514-521.
[19]JIN Z,ZHU D,HU W,et al.Mesogenetic dissolution of the middle Ordovician limestone in the Tahe oilfield of Tarim basin,NW China.Marine&Petroleum Geology,2009,26(6):753-763.
[20]JIN Zhenkui,YU Kuanhong.Characteristics and significance of the burial dissolution of dolomite reservoirs:Taking the Lower Paleozoic in eastern Tarim Basin as an example.Petroleum Exploration and Development,2011,38(4):428-434.
[21]LEI Chuan,CHEN Honghan,SU Ao,et al.Study progress on buried dissolution in carbonate rock.Fault-Block Oil&Gas Field,2014,21(2):165-170.
[22]SHEN Anjiang,SHE Min,HU Anping,et al.Scale and distribution of marine carbonate burial dissolutional pores.Natural Gas Geoscience,2015,26(10):1823-1830
[23]MAZZULLO S J.Overview of porosity evolution in carbonate reservoirs.Kansas Geological Society Bulletin,2004,79:20-28.
[24]SHE Min,SHOU Jianfeng,SHEN Anjiang,et al.Experimental simulation of dissolution and alteration of burial organic acid fluid on dolomite reservoir.Journal of China University of Petroleum(Natural Science Edition),2014,38(3):10-17.
[25]SONG Wenhai.Research on reservoir-formed conditions of largemedium gas fields of Leshan-Longnvsi palaeohigh.Natural Gas Industry,1996(S1):13-26.
[26]WEI Guoqi,WANG Zhihong,LI Jian,et al.Characteristics of source rocks,resource potential and exploration direction of Sinian and Cambrian in Sichuan Basin.Natural Gas Geoscience,2017,28(1):1-13.
[27]WEI Guoqi,YANG Wei,XIE Wuren,et al.Formation conditions,accumulation models and exploration direction of large gas fields in Sinian-Cambrian,Sichuan Basin.Natural Gas Geoscience,2015,26(5):785-795.
[28]TEINTURIER S,ELIE M,PIRONON J.Oil-cracking processes evidence from synthetic petroleum inclusions.Journal of Geochemical Exploration,2003,78(3):421-425.