地质力学学报2018，Vol.24Issue(2)：212-219,8.DOI:10.12090/j.issn.1006-6616.2018.24.02.022
川中南部地区下二叠统栖霞组白云岩储层成因研究
THE GENESIS OF THE DOLOMITIC RESERVOIRS OF THE LOWER PERMIAN QIXIA FORMATION IN THE SOUTH CENTRAL SICHUAN BASIN
摘要
Abstract
During the exploration of the south central Sichuan Basin,the fine-medium grained dolostones of Lower Permian Qixia Formation was found as good reservoir rocks.Industrial gas flows were obtained in numbers of development wells, which reveals great potentiality of the gas exploration.For the further prediction of dolomite reservoir distribution characteristics in central and southern regions, speeding up the next exploration and development of the study area, the genesis of dolomite reservoir is studied through the application of reservoir lithology recognition, carbon and oxygen isotope, fluid inclusion, cathodoluminescence and rare earth elements analysis in this study.The results show that, in the Qixia Formation,the dolostones formed without associated gypsum or other evaporites; the reservoir rocks are mainly gray fine-medium grained dolostones, which spread mainly in the Qier Group.According to a series of reservoir rock analysis, the δ13C content is 4.03 ~4.77‰; the paleosalinity varies among 131.74~133.39; the homogenization temperatures of fluid inclusions are among 110 ~180 ℃; the cathodeluminescence is fairly weak, and the dolomitic matrix reflects purple red light, while the saddle dolomite filled in the vugs absorbs all the light; the distribution tend of light rare earth elements and heavy ones are consistent with the protolith.Overall, in this study it is believed that the Qier Group dolomites were formed during the burial stage,while saddle dolomites filled in the vugs and fractures were formed due to a hydrothermal cause.关键词
栖霞组/白云岩/阴极发光/包裹体/埋藏成因/热液成因Key words
the Qixia Formation/dolostone/cathodoluminescence/inclusions/buried genesis/hydrothermal genesis分类
天文与地球科学引用本文复制引用
赵娟,曾德铭,梁锋,范玲,侯甫,宋林珂,王家树,滕怡葳..川中南部地区下二叠统栖霞组白云岩储层成因研究[J].地质力学学报,2018,24(2):212-219,8.基金项目
中国石油西南油气田分公司川中油气矿项目(20150302-02-04) （20150302-02-04）
