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海相膏盐岩层系烃源岩形成演化特征初探

作    者:赵 恒1,2,5, 刘文汇3, 李艳杰1, 刘全有4, 周 冰4, 罗厚勇3,王 杰4, 卢龙飞4, 孟庆强4, 吴小奇4
单    位:1 江苏地质矿产设计研究院/中国煤炭地质总局煤系矿产资源重点实验室/中国煤炭地质总局页岩气重点实验室;2 甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室;3 西北大学;4 中国石油化工股份有限公司石油勘探开发研究院;5 中国科学院大学
基金项目:受国家自然科学基金重点项目“海相含膏盐岩层系烃源岩发育特征与生烃潜力评价”等多项资助
摘    要:
勘探实践和地质地球化学分析显示,膏盐岩作为一种化学沉积岩虽然本身不具备生烃能力,但其岩系组合中不同程度富含的生烃物质,使得膏盐岩层系可作为海相盆地非常重要的烃源岩,因此,我国的高演化、低有机质丰度的海相膏盐岩层系也可以作为良好的烃源岩。分析表明:海相膏盐岩层系烃源岩具有多元化的生烃物质、异常活跃的有机-无机相互作用和膏盐岩层系特殊的物理化学条件,这些因素共同影响着其生烃物质来源、有机质热演化进程、产物的组分及产率、稳定同位素组成等特征,因此研究膏盐岩层系烃源岩的形成演化特征,对于我国海相膏盐岩层系源-藏匹配、生烃机理、烃源岩评价等问题具有重要的勘探实践和理论研究意义。此外,由于海相膏盐岩层系在成源和矿物组成方面的特殊性,传统的烃源岩评价指标如TOC、氯仿沥青“A”、S1+S2等难以适用于海相膏盐岩层系烃源岩,而采用总生烃碳的概念评价烃源岩演化及生烃潜力应该更为客观可靠。
关键词:海相;膏盐岩层系;烃源岩;总生烃碳;有机酸盐

A preliminary study on hydrocarbon generation and evaluation of marine gypsum/salt-bearing source rocks

Author's Name: ZHAO Heng, LIU Wenhui, LI Yanjie, LIU Quanyou, ZHOU Bing, LUO Houyong, WANG Jie, LU Longfei, MENG Qingqiang, WU Xiaoqi
Institution: University of Chinese Academy of Sciences
Abstract:
Gypsum/salt-bearing strata series have been proved to be a very important hydrocarbon source in marine basins according to oil-gas exploration and geological-geochemical analysis, and the marine gypsum/salt beds with high maturity and low TOC in China can also act as a good source rock. The marine gypsum/salt strata have several hydrocarbon-generation substances, extremely active organic-inorganic interactions, and special physical-chemical conditions. These factors act synergistically in affecting the source of hydrocarbon, thermal evolution process of organic matter, component, stable isotopic composition and yield of the product. Therefore, the study of hydrocarbon generation of gypsum/salt-bearing source bed has important practical and theoretical significance to China’s source-reservoir matching in marine gypsum/salt strata, hydrocarbon-generation mechanism and the evaluation of hydrocarbon source rock. Moreover, because of the particularity in hydrocarbon source and the mineral composition of the marine gypsum/salt strata, traditional evaluation indexes of hydrocarbon source rocks such as TOC, Chloroform asphalt “A”, S1+S2, et al, are hardly suitable for marine source rock. So the dynamic evaluation of source rock evolution and hydrocarbon potential should be more objective and reliable by using total hydrocarbon-generation carbon method.
Keywords: marine; gypsum/salt-bearing strata series; evaluation of source rock; total hydrocarbon-generation carbon; organic acid salt
投稿时间:2018-03-27  
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