蒙额参3井石炭二叠系干泉组页岩储层含气性及可压性评价  

Evaluation of Carboniferous-Permian Ganquan Formation shale gas content and fracturing property of Mengecan 3 well

作　　者：李渭[1] 白薷 姜亭[1] 郭望[1] LI Wei;BAI Ru;JIANG Ting;GUO Wang(Xi′an Center of Geological Survey, China Geological Survey, Xi′an 710054, China;Research Institute of Shaanxi Yanchang Petroleum Corporation, Xi′an 710069, China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2020年第5期831-839,共9页Journal of Northwest University（Natural Science Edition）

基　　金：中国地质调查局全国油气资源战略选区调查工程基金资助项目(DD20160201,DD20190113)。

摘　　要：为了深入研究银额盆地吉格达凹陷石炭—二叠系干泉组页岩储层含气性及可压性评价,本研究以蒙额参3井钻探资料为基础,结合测井数据及样品分析测试结果,对该井的岩相、有机地球化学、含气性、岩石力学特征等进行系统分析。研究表明,蒙额参3井干泉组属于浅海相沉积,页岩厚度可达162 m;有机质丰都较高,有机碳含量平均为1.35%,生烃潜量(S1+S2)平均为4.27 mg/g;具有较好的含气性,气测全烃最高1.219%,平均含气量为2.23 m^3/t;天然裂缝发育,脆性指数在53.30%~54.55%,泊松比为0.12~0.31,具备较好的可压性。研究后认为,干泉组具有较好的页岩气勘探前景。To furtherly study the shale gas conditions and fracturing property of Carboniferous-Permian Ganquan Formation in Jigeda Sag of Yingen-Ejina Basin,based on the drilling data of Mengecan3 well,systematical analyses on rock facies,organic geochemistry,gas content and rock mechanical characteristics have been determined in this paper combined with the logging data and sample test results.The research shows that the shale of the Ganquan Formation is a shallow marine deposit with the thickness of shales up to 162m.Organic matter is abundant with an average organic carbon content of 1.35%and an average hydrocarbon generation potential(S1+S2)of 4.27mg/g.The gas content is relatively high and the gas measurement is up to 1.219%of total hydrocarbons with the average gas content is 2.23m^3/t.Natural cracksare developed with brittleness index 53.30~54.55%,Poisson′s ratio 0.12~0.31,suggesting a good compressibility.The favorable conditions above indicate that the Ganquan Formation has good prospects for shale gas exploration,and also provides a basis for subsequent fracturing reconstruction.

关 键 词：银额盆地 干泉组 页岩气 含气性 可压性 

分 类 号：P536[天文地球—古生物学与地层学]