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.
作者
万静雅
Wan Jingya(Research Institute of Exploration and Development, East China Oil and Gas Company, SINOPEC, Nanjing Jiangsu 210011)
出处
《中外能源》
CAS
2019年第6期33-38,共6页
Sino-Global Energy
基金
国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(项目编号:2016ZX05061)
关键词
页岩储层
影响因素
五峰组-龙马溪组
东胜背斜
shale reservoir
influencing factors
Wufeng-Longmaxi Formation
Dongsheng Anticline
