四川盆地龙马溪组页岩各向异性影响因素  

Controlling factors on anisotropy of the Longmaxi Formation shale in the Sichuan Basin

作　　者：周枫[1] 刘卫华[1] 奚相 

机构地区：[1]中国石化石油物探技术研究院,江苏南京211103

出　　处：《地质学刊》2016年第4期583-588,共6页Journal of Geology

基　　金：国家重大专项(2016ZX05036005-001);国家重点基础研究发展计划("973"项目计划)项目(2014CB239201)

摘　　要：四川盆地下志留统的龙马溪组黑色页岩是国内页岩气勘探开发的重点区域,但是有关龙马溪页岩各向异性性质的研究还较少。在实验室开展模拟页岩储层压力条件下的超声波速度测试,研究龙马溪组页岩在不同方向的纵、横波速度以及各向异性参数随压力的变化规律。用矿物分析、X射线扫描的方法,分析页岩各向异性的影响因素,指出黏土含量、层理和有机质是引起龙马溪页岩各向异性的主要原因。The Lower Silurian Longrnaxi Formation shale in the Sichuan Basin is an important shale gas reservoir for shale gas explo- ration in China, but the anisotropy of the Longmaxi Formation shale has been little studied. This study examined the velocity under the reservoir pressure conditions by ultrasonic testing method, and studied the velocity variation patterns of P-wave and S-wave in different directions and those of anisotropy with pressure. Mineral analysis and X-Ray scanning techniques were applied to reveal the controlling factors on the anisotropy. It is inferred that clay content, micro-bedding and organic matter are responsible for the anisotropy.

关 键 词：页岩 速度 各向异性 龙马溪组 四川盆地 

分 类 号：P618.12[天文地球—矿床学]