湖南省保靖地区下寒武统牛蹄塘组页岩气成藏条件分析
|
摘要
为评价湖南省保靖地区寒武系牛蹄塘组页岩气勘探潜力,利用野外地质调查及页岩气井勘探成果资料,结合钻井岩芯样品测试结果,研究了保靖地区牛蹄塘组页岩储层发育特征及其分布规律。保靖下寒武统牛蹄塘组发育被动大陆边缘浅海深水碎屑岩陆棚相黑色碳质页岩、深灰色泥岩、深灰色钙质粉砂岩。该页岩层系分布稳定,厚度较大(90 m),有机质丰度较高(1.48%～3.49%),为I型干酪根,成熟度较高(3.90%～4.86%),处于过成熟阶段;脆性矿物含量较高(38.4%～50.5%),具较好的破裂潜力;成岩作用较深,黏土矿物以伊利石和伊蒙混层为主;页岩孔隙度中等(0.50%～4.24%),渗透率极低(0.000 5×10~(-3)～0.014 6×10~(-3)μm~2)。储集空间有晶体矿物晶面溶蚀孔、矿物边缘溶蚀孔、有机质溶蚀孔、黄铁矿晶间孔、成岩作用解理缝和构造裂缝。综合分析认为,湖南省保靖地区下寒武统牛蹄塘组具有较好的页岩气成藏地质条件,裂缝发育区可促进页岩气聚集,在保靖县东部昂洞—泽碧一带可以加大勘探力度。
In order to evaluate the exploration potential of shale gas in Cambrian Niutitang Formation in Baojing area of Hunan Province, using the data of field geological survey and gas well exploration results, combined with drilling core sample test results, the authors studied the reservoir characteristics and distribution of Niutitang Formation in Baojing area of Hunan Province. The black shale, dark grey mudstone and dark grey calcareous siltstone of passive continental margin deepwater shelf was deposited at Lower Cambrian Niutitang Formation in Baojing area of Hunan Province. The shale layer was stable in distribution, large in thickness(90 m), high in organic matter(1.48%～3.49%) with I type kerogen, high in maturity(3.90%～4.86%) at over mature stage. The content of brittle minerals in reservoir was high(38.4% ～ 50.5%), and it had better fracture potential. Diagenesis was deeper and clay minerals were mainly illite and illite mixed layers. The shale porosity was medium(0.50%～4.24%), and the permeability was very low((0.0005 ～ 0.0146)×10~(-3) μm~2). The reservoir spaces included crystal faces corrosion pores of crystal minerals, mineral marginal dissolution pores, organic matter dissolution pores, pyrite intergranular pores, cleavage joints by diagenesis and structural fractures. Through comprehensive analysis, the authors believed that Niutitang Formation in Baojing area of Hunan Province has good geological condition of shale gas and the fracture developed area can promote shale gas accumulation, so exploration efforts in Angdong-Zebi area in eastern Baojing County showld be increased.
In order to evaluate the exploration potential of shale gas in Cambrian Niutitang Formation in Baojing area of Hunan Province, using the data of field geological survey and gas well exploration results, combined with drilling core sample test results, the authors studied the reservoir characteristics and distribution of Niutitang Formation in Baojing area of Hunan Province. The black shale, dark grey mudstone and dark grey calcareous siltstone of passive continental margin deepwater shelf was deposited at Lower Cambrian Niutitang Formation in Baojing area of Hunan Province. The shale layer was stable in distribution, large in thickness(90 m), high in organic matter(1.48%～3.49%) with I type kerogen, high in maturity(3.90%～4.86%) at over mature stage. The content of brittle minerals in reservoir was high(38.4% ～ 50.5%), and it had better fracture potential. Diagenesis was deeper and clay minerals were mainly illite and illite mixed layers. The shale porosity was medium(0.50%～4.24%), and the permeability was very low((0.0005 ～ 0.0146)×10~(-3) μm~2). The reservoir spaces included crystal faces corrosion pores of crystal minerals, mineral marginal dissolution pores, organic matter dissolution pores, pyrite intergranular pores, cleavage joints by diagenesis and structural fractures. Through comprehensive analysis, the authors believed that Niutitang Formation in Baojing area of Hunan Province has good geological condition of shale gas and the fracture developed area can promote shale gas accumulation, so exploration efforts in Angdong-Zebi area in eastern Baojing County showld be increased.
引文
[1] 栾锡武.中国页岩气开发的实质性突破[J].中国地质调查,2016,3(1):7-13.
[2] 王志刚.涪陵页岩气勘探开发重大突破与启示[J].石油与天然气地质,2015,36(1):1-6.
[3] 蒲泊伶,蒋有录,王毅,等.四川盆地下志留统龙马溪组页岩气成藏条件及有利地区分析[J].石油学报,2010,31(2):225-230.
[4] 李国亮,柏道远,王先辉,等.湘西北地区寒武系牛蹄塘组页岩气资源前景[J].中国地质调查,2015,2(1):31-39.
[5] 李斌.湖南保靖地区龙马溪组页岩气成藏条件分析[J].特种油气藏,2016,23(5):12-16.
[6] 李斌,胡博文,石小虎,等.湘西地区志留纪沉积体系及典型前陆盆地的形成模式研究[J].地学前缘,2015,22(6):167-176.
[7] 李斌,罗群,胡博文,等.湘西地区叠加型前陆盆地沉积环境演化模式研究[J].中国石油勘探,2016,21(6):81-90.
[8] 刘新民,付宜兴,郭战峰,等.中扬子区南华纪以来盆地演化与油气响应特征[J].石油实验地质,2009,31(2):160-165,171.
[9] 汪正江,谢渊,杨平,等.雪峰山西侧震旦纪—早古生代海相盆地演化与油气地质条件[J].地质通报,2012,31(11):1795-1811.
[10] 王剑,段太忠,谢渊,等.扬子地块东南缘大地构造演化及其油气地质意义[J].地质通报,2012,31(11):1739-1749.
[11] 王必金,包汉勇,郭战峰,等.湘鄂西区寒武系层序划分及其对油气勘探的意义[J].石油实验地质,2013,35(4):372-377.
[12] 牟传龙,周恳恳,梁薇,等.中上扬子地区早古生代烃源岩沉积环境与油气勘探[J].地质学报,2011,85(4):526-532.
[13] 邹才能,董大忠,王玉满,等.中国页岩气特征、挑战及前景(一)[J].石油勘探与开发,2015,42(6):689-701.
[14] 周庆华,宋宁,王成章,等.湖南常德地区牛蹄塘组页岩特征及含气性[J].天然气地球科学,2015,26(2):301-311.
[15] 张廷山,彭志,杨巍,等.美国页岩油研究对我国的启示[J].岩性油气藏,2015,27(3):1-10.
[16] 朱彤,曹艳,张快.美国典型页岩气藏类型及勘探开发启示[J].石油实验地质,2014,36(6):718-724.
[17] 刘江涛,刘双莲,李永杰,等.焦石坝地区奥陶系五峰组—志留系龙马溪组页岩地球化学特征及地质意义[J].油气地质与采收率,2016,23(3):53-57.
[2] 王志刚.涪陵页岩气勘探开发重大突破与启示[J].石油与天然气地质,2015,36(1):1-6.
[3] 蒲泊伶,蒋有录,王毅,等.四川盆地下志留统龙马溪组页岩气成藏条件及有利地区分析[J].石油学报,2010,31(2):225-230.
[4] 李国亮,柏道远,王先辉,等.湘西北地区寒武系牛蹄塘组页岩气资源前景[J].中国地质调查,2015,2(1):31-39.
[5] 李斌.湖南保靖地区龙马溪组页岩气成藏条件分析[J].特种油气藏,2016,23(5):12-16.
[6] 李斌,胡博文,石小虎,等.湘西地区志留纪沉积体系及典型前陆盆地的形成模式研究[J].地学前缘,2015,22(6):167-176.
[7] 李斌,罗群,胡博文,等.湘西地区叠加型前陆盆地沉积环境演化模式研究[J].中国石油勘探,2016,21(6):81-90.
[8] 刘新民,付宜兴,郭战峰,等.中扬子区南华纪以来盆地演化与油气响应特征[J].石油实验地质,2009,31(2):160-165,171.
[9] 汪正江,谢渊,杨平,等.雪峰山西侧震旦纪—早古生代海相盆地演化与油气地质条件[J].地质通报,2012,31(11):1795-1811.
[10] 王剑,段太忠,谢渊,等.扬子地块东南缘大地构造演化及其油气地质意义[J].地质通报,2012,31(11):1739-1749.
[11] 王必金,包汉勇,郭战峰,等.湘鄂西区寒武系层序划分及其对油气勘探的意义[J].石油实验地质,2013,35(4):372-377.
[12] 牟传龙,周恳恳,梁薇,等.中上扬子地区早古生代烃源岩沉积环境与油气勘探[J].地质学报,2011,85(4):526-532.
[13] 邹才能,董大忠,王玉满,等.中国页岩气特征、挑战及前景(一)[J].石油勘探与开发,2015,42(6):689-701.
[14] 周庆华,宋宁,王成章,等.湖南常德地区牛蹄塘组页岩特征及含气性[J].天然气地球科学,2015,26(2):301-311.
[15] 张廷山,彭志,杨巍,等.美国页岩油研究对我国的启示[J].岩性油气藏,2015,27(3):1-10.
[16] 朱彤,曹艳,张快.美国典型页岩气藏类型及勘探开发启示[J].石油实验地质,2014,36(6):718-724.
[17] 刘江涛,刘双莲,李永杰,等.焦石坝地区奥陶系五峰组—志留系龙马溪组页岩地球化学特征及地质意义[J].油气地质与采收率,2016,23(3):53-57.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |