威远地区龙马溪组页岩气储层测井解释分析

Logging interpretation and analysis of shale gas reservior in Longmaxi Formation of Weiyuan Area

针对四川盆地威远地区龙马溪组研究区是否具有勘探开发潜力的问题,以威远202井为例,结合常规测量以及微电阻率扫描成像(FMI)、声波扫描(Sonic Scanner)、元素俘获谱(ECS)和综合地层评价(ELAN)对目的层段龙马溪组页岩的有机碳、物性、含气性及裂缝特征进行了解释评价,得出该区龙马溪组储层矿物含量较好,中上部TOC含量较高,孔隙度约为4.2%,裂缝发育程度一般:高导缝的倾角集中在12°~60°之间,为低—中高角度裂缝。微断层走向与高导缝走向较为一致,近北东—南西向,具有较好的勘探开发潜力。

Aimed at the problems of determining whether the study area has the potentials of exploration and development, the paper took Weiyuan 202 well as an example to explain and evaluate the characteristics of organic carbon,physical property,gas content and cracks of the target layer of Longmaxi shale by combining with conventional measurements and micro resistivity scanning imaging （FMI） , a-coustic scanning（ scanner sonic） ,elemental capture spectroscopy（ ECS） and comprehensive formation evaluation（ ELAN） . The research shows that the mineral content in Longmaxi formation is much better, High TOC content in the middle and upper,the porosity is about 4.2% ,the degree of fracture development is general：high conductive fracture angle concentrated between 12 and 60 degrees,is low in high angle fracture. There are two groups of dominant direction：tendency of NNE-South South West,North East and west to southwest; micro faults and high seam have the same direction which is NE-SW. Longmaxi formation has the good potential of exploration and de-velopment.