江汉平原区古生界地层水化学特征与油气保存  

Hydrochemical characteristics and hydrocarbon preservation of Palaeozoic formation in Jianghan Plain

作　　者：梁家驹[1] 徐国盛[1] 李昌鸿[2] 胡晓凤[2] 林娟华[2] 王德斌[1] 宋焕荣[1] 黄尚瑜[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]江汉油田分公司勘探开发研究院,湖北潜江433124

出　　处：《断块油气田》2010年第2期129-133,共5页Fault-Block Oil & Gas Field

基　　金：国家重点基础研究发展规划(973)项目"中国海相碳酸盐岩层系深层油气成藏机理"(2005CB422106);中国石油化工股份有限公司前瞻性项目"华南古板块地裂运动与海相油气前景"(PH08001)资助

摘　　要：地层水是油气运聚散的动力和载体,其化学成分直接或间接地反映了油气赋存的环境与条件。因此,对地层水的研究有助于了解油气的保存状况。在整理分析江汉平原区古生界海相地层水化学资料的基础上,统计分析了古生界各储层地层水的矿化度,计算了水化学特征系数,包括Na+/Cl-、Ca2+/Mg2+、(Cl--Na+)/Mg2+、Cl-/Mg2+及IBE等,并将各参数与国内外各大油气田进行比较,对江汉平原区油气保存条件作出评价。在此基础上,根据统计学中的对应分析法,以Cl-、Na++K+、矿化度、Na+/Cl-、SO42-×100/Cl-、(HCO3-+CO32-)/Ca2+、CaHCO3+、CaSO40等8个指标作为评价因子,对江汉平原区古生界地层水的水化学特征作了对应分析,探讨了水化学特征与油气保存条件之关系,评价了不同层位的油气封存性,为该区古生界海相地层下一步的油气勘探提供科学依据。Formation water is the driving force and carrier of hydrocarbon migration and accumulation and its chemical compositions can reflect the environment and conditions of oil and gas accumulation directly or indirectly. Therefor, the study of formation water is helpful for understanding the preservation of oil and gas. On the basis of hydrochemical data of Palaeozoic marine formation in Jianghan Plain, this paper analyzes the mineralization of Palaeozoic reservoirs and calculates the hydroehemical characteristics coefficient of water samples, including of Na＋/Cl^-, Ca^2＋/Mg^2＋,（Cl^--Na^＋）/Mg^2＋, Cl^-/Mg^2＋ and IBE. The various hydroehemical characteristics parameters are compared with the ones of major oilfields at home and abroad. The preservation conditions of oil and gas are evaluated for Jianghan Plain in the paper. Based on the correspondence analysis method on statistics, we conduct the correspondence analysis of hydrochemical characteristics of Palaeozoic formation in Jianghan Plain, regarding Cl^-, Na^＋＋K^＋, mineralization, Na^＋/Cl^-, SO4^2-×100/Cl^-, （HCO3^-＋CO3^2-）/Ca^2＋, CaHCO3^＋ and CaSO4^0 as evaluating factors. We study the relationship between hydrochemieal characteristics and hydrocarbon preservation conditions and then evaluate the oil and gas preservation for different strata in Jianghan Plain. The beneficial preservation areas of oil and gas are pointed out, which provides a scientific evidence for oil and gas exploration of Palaeozoic marine formation in Jianghan Plain.

关 键 词：古生界 水化学特征 对应分析 油气保存 海相地层 江汉平原区 

分 类 号：TE133.2[石油与天然气工程—油气勘探]