川东南丁山地区页岩气保存条件分析
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何顺(1993—),男,湖北应城人,在读硕士研究生,从事裂缝发育特征研究。联系电话:17394943836,E-mail:2535081975@qq.com。

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国家科技重大专项“四川盆地重点地区地应力与裂缝发育规律及评价方法研究”(2017ZX05036-003-003)。


Shale gas preservation conditions in Dingshan area,Southeastern Sichuan
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    摘要:

    川东南丁山地区是近年来四川盆地页岩气勘探开发的重点地区,保存条件是决定页岩气形成后能否富集成藏的关键因素。通过分析断裂特征、构造部位及形态等构造因素和顶底板条件、埋深与地层压力系数、水文地质及气体组分条件等非构造因素,对川东南丁山地区页岩气的保存条件进行研究。结果表明:研究区页岩气保存条件具有明显的分带特征。距齐岳山隐伏断裂较近区域的页岩层埋藏浅、地层压力系数小,保存条件差;距齐岳山隐伏断裂较远处的页岩层埋深适中、地层压力系数较大,保存条件良好。构造部位和断裂发育特征是制约丁山地区页岩气保存条件的重要因素,构造部位决定断裂发育程度和地层压力系数,断裂走向及其与最大水平主应力方向的夹角决定地层的封闭性和水文地质条件。距齐岳山隐伏断裂较远处的页岩层以逆断层发育为主,与最大水平主应力方向的夹角以大于45°为主,可以有效抑制页岩气的垂向逸散;距齐岳山隐伏断裂较近处的页岩层,由于断裂过于发育,切穿顶底板地层,有利于页岩气的垂向逸散,保存条件差。

    Abstract:

    Dingshan area is a hot field in the exploration and development of shale gas in Southeastern Sichuan in recent years,preservation conditions are important for the accumulation of shale gas after its generation. Through the analysis of structure factors such as fracture characteristics,structure location and shape,and other non-tectonic factors such as shale gas roof and floor condition,depth and formation pressure coefficient,hydrogeology and gas composition,the shale gas preservation condition was analyzed in the study area. The results show that the preservation condition of Dingshan area has obvious zoning characteristic. The shale stratus close to Qiyueshan buried fault are characterized by poor preservation conditions with shallow depth and small formation pressure coefficient. The shale stratus far to Qiyueshan fault are characterized by good preservation conditions with moderate depth and high stratigraphic pressure. Structure location and fracture development characteristics are the most important factors restricting the shale gas preservation in Dingshan area. Structure location determines the fracture development and formation pressure coefficient. Fault strike and its direction to the maximum horizontal principal stress determine the sealing and hydrogeological conditions of the formation. The shale stratus far away from Qiyueshan buried fault are dominated by thrust faults,and their angle with the maximum horizontal principal stress are mainly more than 45°,which can effectively suppress the vertical escape of shale gas. Faults are extensively developed close to Qiyueshan buried fault and they cut through the upper and bottom strata,which facilitate the vertical dissipation of shale gas,and lead to a poor preservation condition.

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何顺,秦启荣,范存辉,周吉羚,魏志红,黄为.川东南丁山地区页岩气保存条件分析[J].油气地质与采收率,2019,26(2):24~31

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  • 在线发布日期: 2019-05-30
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