东胜背斜A井五峰组——龙马溪组页岩储层特征及影响因素
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摘要
东胜背斜五峰组—龙马溪组页岩具有分布广泛、埋深适中、厚度大、有机质丰富、成熟度高等特点。利用典型井A井岩心照片、录井、测井和实验分析等资料,从岩性与矿物、有机地球化学、孔渗与裂缝特征等方面开展研究,明确了东胜地区五峰组—龙马溪组页岩储层特征及影响因素。研究认为:A井钻遇五峰组—龙马溪组深水陆棚相优质页岩30m,TOC为3.1%,Ro为2.72%,地化指标优越。有机孔发育,孔径以40～300nm为主,连通性好,测井解释优质页岩孔隙度平均为4.54%,储集条件优越。优质页岩段水平缝、页理、高角度裂缝发育,多为方解石半充填—全充填。优质页岩段总含气量3.2m~3/t,揭示良好含气性。储层主要受成岩作用、热演化程度、地层压力三因素控制。压实作用、胶结作用、有机质热成熟作用、溶蚀作用、构造破裂作用等成岩作用对有机孔隙的形成与演化具有重要作用。热演化程度是有机孔隙的主要影响因素。地层压力是有机孔隙发育的关键因素。
The shale in Wufeng-Longmaxi Formation of Dongsheng Anticline has the characteristics of wide distribution,moderate buried depth,large thickness,high abundance of organic matter and high maturity.Based on core photo,logging,experimental analysis and other data of typical Well A,its reservoir characteristics and influencing factors were studied from the aspects of lithology and minerals,organic geochemistry,porosity,permeability and fracture features and so on.The research results are as follows.The high-quality shale of deep-water continental shelf facies drilled by Well A is 30 meters thick.The geochemical index of Wufeng-Long-maxi Formation shale in the research area are superior :TOC is 3.1% and Ro is 2.72%.The organic pores well developed with the pore diameter of 40-300 nm mainly,so the connectivity is good.The storage conditions are superior with average porosity of high-quality shale interpreted by well logging of 4.54%.The horizontal fractures,lamellation,high-angle fractures developed at the high-quality shale sections filled with calcite semifilling-fully filling mostly.The total gas content of the high-quality shale section is 3.2 m~3/t,revealing good gas-bearing properties.The reservoirs are mainly controlled by three factors: diagenesis,thermal evolution and formation pressure.The compaction,cementation,organic matter thermal maturation,dissolution,and structural rupture and other diagenesis play an important role in the formation and evolution of the organic pores.The thermal evolution degree is the main influencing factor of organic pores.The formation pressure is the key factors of the development of organic pores.
The shale in Wufeng-Longmaxi Formation of Dongsheng Anticline has the characteristics of wide distribution,moderate buried depth,large thickness,high abundance of organic matter and high maturity.Based on core photo,logging,experimental analysis and other data of typical Well A,its reservoir characteristics and influencing factors were studied from the aspects of lithology and minerals,organic geochemistry,porosity,permeability and fracture features and so on.The research results are as follows.The high-quality shale of deep-water continental shelf facies drilled by Well A is 30 meters thick.The geochemical index of Wufeng-Long-maxi Formation shale in the research area are superior :TOC is 3.1% and Ro is 2.72%.The organic pores well developed with the pore diameter of 40-300 nm mainly,so the connectivity is good.The storage conditions are superior with average porosity of high-quality shale interpreted by well logging of 4.54%.The horizontal fractures,lamellation,high-angle fractures developed at the high-quality shale sections filled with calcite semifilling-fully filling mostly.The total gas content of the high-quality shale section is 3.2 m~3/t,revealing good gas-bearing properties.The reservoirs are mainly controlled by three factors: diagenesis,thermal evolution and formation pressure.The compaction,cementation,organic matter thermal maturation,dissolution,and structural rupture and other diagenesis play an important role in the formation and evolution of the organic pores.The thermal evolution degree is the main influencing factor of organic pores.The formation pressure is the key factors of the development of organic pores.
引文
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[16]王茂桢,柳少波,任拥军,等.页岩气储层黏土矿物孔隙特征及其甲烷吸附作用[J].地质论评,2015,61(1):207-216.
[2]郭旭升.南方海相页岩气“二元富集”规律———四川盆地及周缘龙马溪组页岩气勘探实践认识[J].地质学报,2014,88(7):1209-1218.
[3]董大忠,邹才能,杨桦,等.中国页岩气勘探开发进展与发展前景[J].石油学报,2012,33(增1):107-114.
[4]郭彤楼,刘若冰.复杂构造区高演化程度海相页岩气勘探突破的启示:以四川盆地东部盆缘JY1井为例[J].天然气地球科学,2013,24(4):643-651.
[5]王鹏万,李昌,张磊,等.五峰组—龙马溪组储层特征及甜点层段评价———以昭通页岩气示范区A井为例[J].煤炭学报,2017,42(11):2925-2935.
[6]张晓明,石万忠,徐清海,等.四川盆地焦石坝地区页岩气储层特征及控制因素[J].石油学报,2015,36(8):926-953.
[7]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.
[8]陈静.中扬子地区页岩气勘探潜力分析[J].科技创业月刊,2015,28(6):10-11.
[9]王志刚.涪陵礁石坝地区页岩气水平井压裂改造实践与认识[J].石油与天然气地质,2014,35(3):425-430.
[10]何希鹏,张培先,房大志,等.渝东南彭水—武隆地区常压页岩气生产特征[J].油气地质与采收率,2018,25(5):72-79.
[11]侯宇光,何生,易积正,等.页岩孔隙结构对甲烷吸附能力的影响[J].石油勘探与开发,2014,41(2):248-256.
[12]赵圣贤,杨跃明,张鉴,等.四川盆地下志留统龙马溪组页岩小层划分与储层精细对比[J].天然气地球科学,2016,27(3):470-487.
[13]王秀平,牟传龙,葛祥英,等.四川盆地南部及其周缘龙马溪组黏土矿物研究[J].天然气地球科学,2014,25(11):1781-1794.
[14]曾辉.黔南坳陷九门冲组富有机质页岩无机孔隙定量评价[J].石油天然气学报(江汉石油学院学报),2013,35(9):34-40.
[15]董大忠,高世葵,黄金亮,等.论四川盆地页岩气资源勘探开发前景[J].天然气工业,2014,34(12):1-15.
[16]王茂桢,柳少波,任拥军,等.页岩气储层黏土矿物孔隙特征及其甲烷吸附作用[J].地质论评,2015,61(1):207-216.