川东南DS地区龙马溪组页岩气形成及富集控制因素
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摘要
为研究川东南DS地区页岩气富集情况,综合分析DS地区页岩气生气条件、储集空间以及保存条件,对该地区页岩气富集条件进行研究。结果表明:研究区页岩有机质类型以Ⅰ型干酪根为主,厚度大,TOC为2.00%～6.67%,Ro为2.20%～3.36%,处于过成熟产干气阶段;页岩有机质含量高,有机质孔及微裂缝发育,提供页岩气储集空间及横向渗流通道; DY2、DY4井埋藏深度适中,压力系数大于1.2,单井日产量分别为10.5×10~4m~3/d和20.0×10~4m~3/d,属高产页岩气井。通过对烃源、储集空间及保存条件的综合分析,认为有机质及孔隙发育、埋藏适中、压力系数大、保存条件良好的区域是页岩气有力勘探区。该研究可为今后相似地区的页岩气勘探提供借鉴。
In order to clarify the shale gas enrichment in the DS of Southeast Sichuan,the shale gas generation condition,reservoir space and preservation condition were comprehensively analyzed to study the shale gas enrichment condition in the area.Research indicates that the organic matter of the shale with large thickness in the area is mainly dominated by Type-I kerogen,the TOC is 2.00%-6.67% and the Rois 2.20%-3..36%,which is considered within the stage of over-mature dry gas generation.The high organic matter content and well-developed reservoir pores and micro-fractures provide reservoir space and lateral seepage channel for shale gas.The pressure coefficients of Well DY2 and Well DY4 with medium buried depth exceed 1.2,the corresponding daily shale gas productions are 10.5×10~4m~3/d and 20.0×10~4m~3/d respectively,which are classified as high production shale gas well.The comprehensive analysis of hydrocarbon source-rock,reservoir space and preservation condition indicates that the favorable exploration zone is characterized by well-developed organic matter and pore,medium buried depth,high pressure coefficient and better preservation condition.This research could provide certain reference for the shale gas exploration in similar areas.
In order to clarify the shale gas enrichment in the DS of Southeast Sichuan,the shale gas generation condition,reservoir space and preservation condition were comprehensively analyzed to study the shale gas enrichment condition in the area.Research indicates that the organic matter of the shale with large thickness in the area is mainly dominated by Type-I kerogen,the TOC is 2.00%-6.67% and the Rois 2.20%-3..36%,which is considered within the stage of over-mature dry gas generation.The high organic matter content and well-developed reservoir pores and micro-fractures provide reservoir space and lateral seepage channel for shale gas.The pressure coefficients of Well DY2 and Well DY4 with medium buried depth exceed 1.2,the corresponding daily shale gas productions are 10.5×10~4m~3/d and 20.0×10~4m~3/d respectively,which are classified as high production shale gas well.The comprehensive analysis of hydrocarbon source-rock,reservoir space and preservation condition indicates that the favorable exploration zone is characterized by well-developed organic matter and pore,medium buried depth,high pressure coefficient and better preservation condition.This research could provide certain reference for the shale gas exploration in similar areas.
引文
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[19]邹玉涛,段金宝,赵艳军,等.川东高陡断褶带构造特征及其演化[J].地质学报,2015,89(11):2046-2052.
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[21]刘树根,邓宾,钟勇,等.四川盆地及周缘下古生界页岩气深埋藏-强改造独特地质作用[J].地学前缘,2016,23(1):11-28.
[22]翟常博.川东南綦江仁怀地区页岩气成蔵条件及有利目标区研究[D].北京:中国地质大学(北京),2013.
[2]康建威,林小兵,余谦,等.复杂构造背景区页岩气富集条件研究---以大巴山前缘地区为例[J].石油实验地质,2017,39(4):437-443.
[3]聂海宽,金之钧,边瑞康,等.四川盆地及其周缘上奥陶统五峰组-下志留统龙马溪组页岩气“源-盖控藏”富集[J].石油学报,2016,37(5):557-571.
[4]张春明,张维生,郭英海.川东南-黔北地区龙马溪组沉积环境及对烃源岩的影响[J].地学前缘,2012,19(1):136-145.
[5]梁狄刚,郭彤楼,边立曾,等.中国南方海相生烃成藏研究的若干新进展(三)南方四套区域性海相烃源岩的沉积相及发育的控制因素[J].海相油气地质,2009,14(2):1-19.
[6]魏志红.富有机质页岩有机质孔发育差异性探讨---以四川盆地五峰组-龙马溪组笔石页岩为例[J].成都理工大学学报(自然科学版),2015,42(3):361-365.
[7]冉琦,陈勇,齐晴,等.丁山地区龙马溪组页岩气保存条件分析[J].石油地质与工程,2017,31(4):22-25.
[8]冯动军,胡宗全,高波,等.川东南地区五峰组-龙马溪组页岩气成藏条件分析[J].地质论评,2016,62(6):1521-1532.
[9]熊德明,马万云,张明峰,等.干酪根类型及生烃潜力确定新方法[J].天然气地球科学,2014,25(6):898-905.
[10]林彤,雍自权,刘树根,等.川东南石林地区五峰组-龙马溪组黑色页岩特征[J].东北石油大学学报,2015,39(3):83-93.
[11]罗小平,吴飘,赵建红,等.富有机质泥页岩有机质孔隙研究进展[J].成都理工大学学报(自然科学版),2015,42(1):50-59.
[12]胡明毅,邱小松,胡忠贵,等.页岩气储层研究现状及存在问题探讨[J].特种油气藏,2015,22(2):1-7.
[13]黄金亮,邹才能,李建忠,等.川南下寒武统筇竹寺组页岩气形成条件及资源潜力[J].石油勘探与开发,2012,39(1):69-75.
[14]王艿川,赵靖舟,丁文龙,等.渝东南地区龙马溪组页岩裂缝发育特征[J].天然气地球科学,2015,26(4):760-770.
[15]卢龙飞,秦建中,申宝剑,等.川东南涪陵地区五峰-龙马溪组硅质页岩的生物成因及其油气地质意义[J].石油实验地质,2016,38(4):460-465.
[16]余川.川东南地区下志留统页岩气成藏条件及资源潜力分析[D].成都:西南石油大学,2012.
[17]汤济广,李豫,汪凯明,等.四川盆地东南地区龙马溪组页岩气有效保存区综合评价[J].天然气工业,2015,35(5):15-23.
[18]金之钧,胡宗全,高波,等.川东南地区五峰组-龙马溪组页岩气富集与高产控制因素[J].地学前缘,2016,23(1):1-10.
[19]邹玉涛,段金宝,赵艳军,等.川东高陡断褶带构造特征及其演化[J].地质学报,2015,89(11):2046-2052.
[20]董大忠,王玉满,黄旭楠,等.中国页岩气地质特征、资源评价方法及关键参数[J].天然气地球科学,2016,27(9):1583-1601.
[21]刘树根,邓宾,钟勇,等.四川盆地及周缘下古生界页岩气深埋藏-强改造独特地质作用[J].地学前缘,2016,23(1):11-28.
[22]翟常博.川东南綦江仁怀地区页岩气成蔵条件及有利目标区研究[D].北京:中国地质大学(北京),2013.