南华北盆地通许地区上古生界天然气勘探前景
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摘要
南华北盆地通许地区上古生界石炭系—二叠系保存较全,天然气成藏条件与鄂尔多斯盆地类似。运用鄂尔多斯盆地致密砂岩气藏成藏理论,分析南华北盆地通许地区上古生界基本油气地质条件、圈闭形成期与天然气运聚成藏期的匹配关系,明确该区天然气勘探前景。研究表明:通许地区石炭系—二叠系发育一套良好的区域性烃源岩,煤层发育,平均有机碳的质量分数为62.9%,平均有机质成熟度为3.34%,有机质类型属于Ⅱ2型;储集岩主要为大面积分布的三角洲平原分流河道砂岩,平均孔隙度为2.7%,平均渗透率为2.25 m D,发育粒间孔和粒间溶孔;上、下石盒子组泥岩发育,饱和气时突破压力为5.88~9.80 MPa,是良好的区域性盖层;致密砂岩岩性圈闭为该区最有利的圈闭类型;圈闭形成于烃源岩主生排烃期以前,源-储匹配关系好,具有良好的致密砂岩气勘探前景;尉北缓坡中南部是致密砂岩岩性圈闭气藏发育的有利区。
The Carboniferous and Permian strata in Tongxu area of southern North China Basin are relatively complete preserved. The natural gas reservoir conditions are similar to those of the Ordos Basin. Based on the theory of tight sandstone gas reservoir forming in Ordos Basin, the basic petroleum geological conditions and the relationship between trap formation period and gas migration and accumulation period of the Upper Paleozoic were analyzed, then the gas exploration prospects of this area can be explicit. The research shows that the coal of Carboniferous and Permian in Tongxu area is well developed, the average organic carbon content of coal is 62.9%, the average maturity of organic matter is 3.34%, and the organic matter of coal belongs to Ⅱ2 type, which is a good regional source rock. Reservoir rocks mainly distributed in a large area of delta plain distributary channel sandstone, and average porosity is 2.7%,the average permeability is 2.25 m D, and intergranular pore and intergranular dissolved pore are developed. Mudstone of Upper and Lower Shihezi Formation is developed. The breakthrough pressure of mudstone saturated with gas is 5.88-9.80 MPa, and it is a good regional cap rock. The tight sandstone lithologic trap is the most favorable trap type,and it formed before the hydrocarbon generation, and the matching relationship is good. The central and southern area of the Weibei Slope is favorable for the development of tight sandstone lithologic gas reservoir.
The Carboniferous and Permian strata in Tongxu area of southern North China Basin are relatively complete preserved. The natural gas reservoir conditions are similar to those of the Ordos Basin. Based on the theory of tight sandstone gas reservoir forming in Ordos Basin, the basic petroleum geological conditions and the relationship between trap formation period and gas migration and accumulation period of the Upper Paleozoic were analyzed, then the gas exploration prospects of this area can be explicit. The research shows that the coal of Carboniferous and Permian in Tongxu area is well developed, the average organic carbon content of coal is 62.9%, the average maturity of organic matter is 3.34%, and the organic matter of coal belongs to Ⅱ2 type, which is a good regional source rock. Reservoir rocks mainly distributed in a large area of delta plain distributary channel sandstone, and average porosity is 2.7%,the average permeability is 2.25 m D, and intergranular pore and intergranular dissolved pore are developed. Mudstone of Upper and Lower Shihezi Formation is developed. The breakthrough pressure of mudstone saturated with gas is 5.88-9.80 MPa, and it is a good regional cap rock. The tight sandstone lithologic trap is the most favorable trap type,and it formed before the hydrocarbon generation, and the matching relationship is good. The central and southern area of the Weibei Slope is favorable for the development of tight sandstone lithologic gas reservoir.
引文
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[15]李莹,马明永.南华北盆地周口坳陷二叠系砂岩储层岩石学特征及成岩作用研究[J].石油实验地质,2013,35(6):640-645.Li Ying,Ma Mingyong.Petrography and diagenesis of Permian sandstone reservoirs in Zhoukou Depression,Southern North China Basin[J].Petroleum Geology&Experiment,2013,35(6):640-645.
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[17]王伟力,高海仁.鄂尔多斯盆地中东部致密砂岩储层地质特征及控制因素[J].岩性油气藏,2013,25(6):71-78.Wang Weili,Gao Hairen.Geologic characteristics and controlling factors of tight sand reservoirin the mid-eastern Ordos Basin[J].Lithologic Reservoirs,2013,25(6):71-78.
[18]马超.定北地区下石盒子组盒1段致密砂岩储层特征及影响因素[J].岩性油气藏,2015,27(1):89-94.Ma Chao.Tight sandstone reservoir characteristics and influencing factors of He-1 member of the Lower Shihezi Formation in Dingbei area[J].Lithologic Reservoirs,2015,27(1):89-94.
[2]康玉柱,陈新华.中国石炭—二叠系致密岩油气资源潜力分析[J].新疆石油地质,2014,35(4):375-379.Kang Yuzhu,Chen Xinhua.Analysis of petroleum resource potentials in Carboniferous-Permian dense rocks of China[J].Xinjiang Petroleum Geology,2014,35(4):375-379.
[3]赵东力,赵修军,郑琳,等.通许隆起构造演化史与找煤远景[J].地质与资源,2008,17(2):132-135.Zhao Dongli,Zhao Xiujun,Zheng Lin,et al.Tectonic evolution and coal-searching prospect of Tongxu Uplift[J].Geology and Resources,2008,17(2):132-135.
[4]周小进.南华北上古生界油气成藏关键条件分析[J].石油实验地质,2010,32(5):420-427.Zhou Xiaojin.Analysis of hydrocarbon accumulation conditions of the Upper Palaeozoic sequence of the southern North China Basin[J].Petroleum Geology&Experiment,2010,32(5):420-427.
[5]高建平,周立发,徐艳萍,等.太康隆起和周口坳陷上古生界煤系烃源岩地球化学特征[J].西北地质,2006,39(3):59-64.Gao Jianping,Zhou Lifa,Xu Yanping,et al.Geochemical characteristics of the Upper Paleozoic source rocks in Taikang Rise and Zhoukou Depression[J].Northwestern Geology,2006,39(3):59-64.
[6]全书进,饶丹,孔凡军,等.周口坳陷上古生界油气资源潜力分析[J].石油实验地质,2004,26(6):542-546.Quan shujin,Rao Dan,Kong Fanjun,et al.Potential analysis of the Upper Palaeozoic hydrocarbon resources in the Zhoukou Depression[J].Petroleum Geology&Experiment,2004,26(6):542-546.
[7]张翔,田景春,曹桐生.南华北盆地中二叠统“石盒子组”岩相古地理及储、盖特征研究[J].地层学杂志,2011,35(4):431-439.Zhang Xiang,Tian Jingchun,Cao Tongsheng.Research on lithofacies palaeogeography and reservoir,cap rock characteristics of Middle Permian Shihezi Formation in southern North China Basin[J].Journal of Stratigraphy,2011,35(4):431-439.
[8]郝蜀民,陈召佑,李良.鄂尔多斯大牛地气田致密砂岩气成藏理论与勘探实践[M].北京:石油工业出版社,2011:180-293.Hao Shumin,Chen Zhaoyou,Li Liang.Accumulation theory and exploration practice of tight sandstone gas in the Daniudi Gas Field of Ordos Basin[M].Beijing:Petroleum Industry Press,2011:180-293.
[9]张宝收,鲁雪松,孙雄伟,等.塔里木盆地迪北致密砂岩气藏储层物性下限研究[J].岩性油气藏,2015,27(1):81-88.Zhang Baoshou,Lu Xuesong,Zhang Xiongwei,et al.Study on the lower limit of physical properties of tight sandstone gasreservoirs in Dibei area,Tarim Basin[J].Lithologic Reservoirs,2015,27(1):81-88.
[10]张顺,崔坤宁,张晨晨,等.松辽盆地泉头组三、四段河流相储层岩性油藏控制因素及分布规律[J].石油与天然气地质,2011,32(3):411-419.Zhang Shun,Cui Kunning,Zhang Chenchen,et al.Controlling factors and distribution patterns of Lithologic pools in the fluvial facies of the 3rd and 4th members of the Quantou Formation in the Songliao Basin[J].Oil&Gas Geology,2011,32(3):411-419.
[11]赵俊峰,刘池洋,刘永涛,等.南华北地区上古生界热演化史恢复[J].石油与天然气地质,2011,32(1):64-74.Zhao Junfeng,Liu Chiyang,Liu Yongtao,et al.Reconstruction of thermal evolutionary history of the Upper Paleozoic in the Southern North China[J].Oil&Gas Geology,2011,32(1):64-74.
[12]徐向华,陈新军,雷鸣,等.华北南部地区石炭—二叠系勘探前景分析[J].石油实验地质,2011,33(2):148-154.Xu Xianghua,Chen Xinjun,Lei Ming,et al.Exploration prospects of the Carboniferous and Permian in the southern North China[J].Petroleum Geology&Experiment,2011,33(2):148-154.
[13]侯加根,唐颖,刘钰铭,等.鄂尔多斯盆地苏里格气田东区致密储层分布模式[J].岩性油气藏,2014,26(3):1-6.Hou Jiagen,Tang Ying,Liu Yuming,et al.Distribution patterns of tight reservoirs in eastern Sulige Gas Field,Ordos Basin[J].Lithologic Reservoirs,2014,26(3):1-6.
[14]张安达,王成,乔睿.致密砂岩储层物性下限确定新方法及系统分类[J].岩性油气藏,2014,26(5):5-8.Zhang Anda,Wang Cheng,Qiao Rui.A new method for determining physical property lower limit oftight sandstone reservoir and reservoir system classification[J].Lithologic Reservoirs,2014,26(5):5-8.
[15]李莹,马明永.南华北盆地周口坳陷二叠系砂岩储层岩石学特征及成岩作用研究[J].石油实验地质,2013,35(6):640-645.Li Ying,Ma Mingyong.Petrography and diagenesis of Permian sandstone reservoirs in Zhoukou Depression,Southern North China Basin[J].Petroleum Geology&Experiment,2013,35(6):640-645.
[16]解东宁,周立发.南华北地区石炭—二叠纪煤系生烃潜力与二次生烃探讨[J].煤田地质与勘探,2006,34(1):30-33.Jie Dongning,Zhou Lifa.Discussion on hydrocarbon generation potential and secondary hydrocarbon generation of organic matter from Permo-Carboniferous coal measures in the Southern North China[J].Coal Geology&Exploration,2006,34(1):30-33.
[17]王伟力,高海仁.鄂尔多斯盆地中东部致密砂岩储层地质特征及控制因素[J].岩性油气藏,2013,25(6):71-78.Wang Weili,Gao Hairen.Geologic characteristics and controlling factors of tight sand reservoirin the mid-eastern Ordos Basin[J].Lithologic Reservoirs,2013,25(6):71-78.
[18]马超.定北地区下石盒子组盒1段致密砂岩储层特征及影响因素[J].岩性油气藏,2015,27(1):89-94.Ma Chao.Tight sandstone reservoir characteristics and influencing factors of He-1 member of the Lower Shihezi Formation in Dingbei area[J].Lithologic Reservoirs,2015,27(1):89-94.