基于砂体构型精细刻画潮坪砂坝优质砂体——以大牛地气田D17井区太原组2段为例
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摘要
以大牛地气田未开发区(D17井区)太原组2段潮坪沉积为研究对象,基于测井、岩性等特征分析,对潮坪砂坝进行了精细刻画,共识别出了砂坝主体、砂坝侧翼及砂坝侧翼叠置3个沉积微相单元,并建立了沉积微相-岩相-测井相-物性-非均质性-试气成果响应模板。对比结果显示,砂坝主体微相岩性主要为(含砾)石英粗砂岩及岩屑石英砂岩,测井曲线具光滑箱形;砂坝侧翼微相岩性主要为中-细粒砂岩岩屑砂岩、岩屑石英砂岩,测井曲线为齿化箱形、齿化钟形以及漏斗形。根据砂体组合类型,区域上划分出了砂坝主体型砂体带与砂坝侧翼型砂体带。前者砂坝宽度为6~8 km,砂体平均厚度为14.5 m,砂地比平均值为0.53,平均渗透率为0.48×10-3μm2。后者砂坝宽度为4~6 km,砂体平均厚度为10.56 m,砂地比平均值为0.36,平均渗透率为0.36×10-3μm2。砂坝主体型砂体带砂体发育规模大,分布范围广,砂体物性好,中等非均质性,试气成果明显,应作为优先开发的地区。
Logging data and lithological analyses of the tidal-flat depositsin the 2ndmember of the Taiyuan Formation(D-17 wellblock) in the Daniudi gas field revealed three sedimentary microfacies: mainsandbar,sandbar flanking and overlain sandbar flanking-.A response-template of sedimentary micro-facies-lithofacies-logging facies-physical property-heterogeneity-gas test was also established.Correlation shows that the main sandbar is mainly gravel-bearing quartzose laterite and lithic quartz sandstone,corresponding to smooth-box type logging curves; and thelatter two are mainly medium-to finegrained lithic sandstone and quartz sandstone,corresponding to dented box-and bell-shaped or funnel-shaped logging curves.Regionally,two belts were identified based on sand body assemblage types: sand body belt consisting main sandbar and sand body belt consisting sandbar flanking.The former is 6-8 km wide,and has an average thickness of 14.5 m,an average net-to-gross ratio of 0.53 and an average permeability of 0.48 × 10-3μm2.The latter is 4-6 km wide and has an average thickness of 10.56 m,an average net-to-gross ratio of 0.36 and an average permeability of 0.36 × 10-3μm2.The former with its well developed and widely distributed sand bodies is considered to be a better development target as it has better physical properties and strong heterogeneity and good gas testing results.
Logging data and lithological analyses of the tidal-flat depositsin the 2ndmember of the Taiyuan Formation(D-17 wellblock) in the Daniudi gas field revealed three sedimentary microfacies: mainsandbar,sandbar flanking and overlain sandbar flanking-.A response-template of sedimentary micro-facies-lithofacies-logging facies-physical property-heterogeneity-gas test was also established.Correlation shows that the main sandbar is mainly gravel-bearing quartzose laterite and lithic quartz sandstone,corresponding to smooth-box type logging curves; and thelatter two are mainly medium-to finegrained lithic sandstone and quartz sandstone,corresponding to dented box-and bell-shaped or funnel-shaped logging curves.Regionally,two belts were identified based on sand body assemblage types: sand body belt consisting main sandbar and sand body belt consisting sandbar flanking.The former is 6-8 km wide,and has an average thickness of 14.5 m,an average net-to-gross ratio of 0.53 and an average permeability of 0.48 × 10-3μm2.The latter is 4-6 km wide and has an average thickness of 10.56 m,an average net-to-gross ratio of 0.36 and an average permeability of 0.36 × 10-3μm2.The former with its well developed and widely distributed sand bodies is considered to be a better development target as it has better physical properties and strong heterogeneity and good gas testing results.
引文
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[2]钱凯,马新华,李景明,等.中国天然气资源[M].北京:石油工业出版社,1999.33-35.Qian Kai,Ma Xinhua,Li Jingming,et al.Natural gas resources in China[M].Beijing:Petroleum Industry Press,1999.33-35.
[3]李景明,李剑,谢增业,等.中国天然气资源研究[J].石油勘探与开发,2005,32(2):15-18.Li Jingming,Li Jian,Xie Zengye,et al.Chinese natural gas resources[J].Petroleum Exploration and Development,2005,32(2):15-18.
[4]赵贤正,李景明,李东旭,等.中国天然气勘探快速发展的十年[M].北京:石油工业出版社,2002,9-16.Zhao Xianzheng,Li Jingming,Li Dongxu,et al.Ten years of rapid natural gas exploration progress in China[M].Beijing:Petroleum Industry Press,2002,9-16.
[5]郝蜀民,惠宽泽,李良.鄂尔多斯盆地大牛地大型低渗气田成藏特征及勘探开发技术[J].石油与天然气地质,2006,27(6):762-768.Hao Shunmin,Hui Kuanyang,Li Liang.Reservoiring features of daniudi low-permeability gas field in drdos basin and its explo-ration and development technologies[J].Oil&Gas Geology,2006,27(6):762-768.
[6]罗东明,谭学群,游玉春,等.沉积环境复杂地区地层划分对比方法—以鄂尔多斯盆地大牛地气田为例[J].石油与天然气地质,2008,29(1):38-44.Luo Dongming,Tan Xuequn,You Yuchun,et al.Stratigraphic division and correlation in areas with complicated sedimentary environment—a case study of Daniudi gas field in the Ordos Basin[J].Oll&gas geology.2008,29(1):38-44.
[7]李良,袁志祥,惠宽洋,等.鄂尔多斯盆地北部上古生界天然气聚集规律[J].石油与天然气地质,2000,21(3):268-271.Li Liang,Yuan Zhixiang,Hui Kuanyang,et al.Accumulation regularity of Upper Paleozoic gas in north Ordos Basin[J].Oil&Gas Geology,2000,21(3):268-271,282.
[8]刘圣志,李景明,孙粉锦,等.鄂尔多斯盆地苏里格气田成藏机理研究[J].天然气工业,2005,25(3):4-6.Liu Shengzhi,Li Jingming,Sun Fenjin,et al.Reservoiring mechanism of Sulige gas field in Erduosi basin[J].Natural Gas Industry,2005,25(3):4-6.
[9]Chen Zhonghui,Zhang Nianmao,Zhang Shouliang,et al.The time and spatial evolution of sedimentary systems and coal-accumulating centre in late Palae-ozoic coal-bearing measures on the eastern margin of Ordos basin,1989,14(4):357-364.
[10]Rosati j d,Dean r g,Stone g w.Across-shore model of barrier island migration over acompressible substrate[J].Marine Geology,2010,271:1-16.
[11]田景春,刘伟伟,王峰,等.鄂尔多斯盆地高桥地区上古生界致密砂岩储层非均质性特征[J].石油与天然气地质,2014,35(2):183-189.Tian Jingchun,Liu Weiwei,Wang Feng,et al.Heterogeneity of the Paleozoic tight sandstone reservoirs in Gaoqiao Area of Ordos Basin[J].Oil&Gas Geology,2014,35(2):183-189.
[12]田景春,张兴良,王峰,等.鄂尔多斯盆地高桥地区上古生界储集砂体叠置关系及分布定量刻画[J].石油与天然气地质,2013,34(6):737-815.Tian Jingchun,Zhang Xingliang,Wang Feng,et al.Quantitative characterization of superimposition relationship and distribution of reservoir sandbodies in the Upper Palaeozoic of Gaoqiao region,the Ordos Basin[J].Oil&Gas Geology,2013,34(6):737-815.
[13]孙素琴.大牛地气田二叠系山西组单砂体预测技术及应用[J].石油实验地质,2012,34(3):340-344.Sun Suqin.Prediction of single sand body and its application in Shanxi Formation of Permian,Daniudi Gas Field[J].Petroleum Geology&Experiment,2012,34(3):340-344.
[14]金惠,施振生,杨威,等.川中地区上三叠统小塘子组障壁砂坝及其成因分析[J].天然气地球科学,2013,24(4):19-28.Jin Hui,Shi Zhensheng,Yang Wei,et al.Barrier island and its genesis analysis of Xiaotangzi Formation of upper Triassic in central Sichuan basin[J].Natural Gas Geoscience,2013,24(1):19-28.
[15]袁静,梁绘媛,谭明友,等.惠民凹陷南坡沙四上亚段滩坝砂体沉积特征及形成条件[J].石油与天然气地质,2014,35(3):410-416.Yuan Jing,Liang Huiyuan,Tan Mingyou,et al.Sedimentary characteristics and forming conditions of beach-bar sandbodies in the upper fourth member of the Shahejie Formation in the south slope of the Huimin Sag[J].Oil&Gas Geology,2014,35(3):410-416.
[16]陈钟惠,张年茂,张守良,等.鄂尔多斯盆地东缘晚古生代含煤岩系沉积体系和聚煤作用的时空演化[J].地球科学-中国地质大学学报,1989,14(4):357-364.Chen Zhonghui,Zhang Nianmao,Zhang Shouliang,et al.TIme and spatial evolution of sedimenttary systems and coal-aaumutation centre in Late Palaeozoic coal-bearing nesaures on the eastern margin of Ordos Basin[J].Earth Science-Journal of China Vniversity of Geosciences,1989,14(4):357-364.
[17]郝蜀民,李良,尤欢增.大牛地气田石炭-二叠系海陆过渡沉积体系与近源成藏模式[J].中国地质,2007,34(4):606-611.Hao Shumin,Li Liang,You Huanzeng.Permo carboniferous paralic depositional systems in the Daniudi gas field and its near-source boxtype gas accumulatiorr forming model[J].Geology in China,2007,34(4):606-611.
[18]于兴河,马兴祥,穆龙新,等.辫状河储层地质模式及层次界面分析[M].石油工业出版社,北京,2004.Yu Xinghe,Ma Xingxiang,Mu Longxin,et al.The braided fluvial river reservoir geologic model and the level interface analysis[m].Petroleum Industry Press,Beijing.2004.