论文详情
临兴地区石盒子组低阻气层成因分析
断块油气田
2020年 27卷 第6期
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Title
Genesis analysis of the low-resistivity gas layer of Shihezi Formation in Linxing area
单位
中海油能源发展股份有限公司工程技术分公司，天津 300452
中联煤层气有限责任公司，北京 100011
Organization
Engineering and Technology Branch, CNOOC Energy Technology and Services Limited, Tianjin 300452, China
China United Coalbed Methane Corporation Limited, Beijing 100011, China
Abstract
In order to elucidate the characteristics and formation of the low?鄄resistivity gas layer of the Shihezi Formation in Linxing area, Ordos Basin, based on the data of cast thin section, laser particle size analysis, scanning electron microscope and high?鄄pressure mercury, six influencing factors of resistivity were analyzed including petrophysical properties, pore structure, immobile water saturation, formation water salinity and mud invasion, conductive minerals and clay minerals. The results show that chlorite film is the main factor for the formation of low?鄄resistivity gas layer in the study area, while the high immobile water saturation caused by microcrystalline kaolinite filling and dividing pores is the background factor for the formation of low?鄄resistivity gas layer in this area. The development of chlorite film is mainly controlled by sedimentation, and its distribution is near the north?鄄south direction, which is consistent with the direction of the river during its period; the formation of microcrystalline kaolinite is mainly influenced by diagenesis, which was mainly formed in the middle diagenesis stage A by the clastic particles such as feldspar and igneous debris that were dissolved by organic acids.
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