摘要
以地层水统计分析为基础,利用氘和氧同位素、铸体薄片及扫描电镜等测试手段,对东濮凹陷文东地区沙三段地层水化学特征、成因及其在成岩作用中的响应进行了研究。结果表明:文东地区沙三段地层水型以Ca Cl2为主,盐岩的溶解控制了地层水矿化度。地层水参数指示沙三段地层封闭性强,水岩作用强烈。相对于Cl-,Na++K+的缺失与阳离子交替吸附作用、斜长石钠长石化及自生伊利石的发育有关;阳离子交替吸附作用、斜长石钠长石化、膏盐岩的溶解、硬石膏胶结物蚀等作用使地层水富Ca2+,白云石化及绿泥石化造成了Mg2+的缺失;膏岩溶解及有机质的成熟使得地层水富含SO42-,HCO3-,Ca SO4与Ca CO3过饱和的流体环境,碳酸盐与硬石膏胶结物十分发育。
Based on the analysis of formation water, applying various measurements such as analysis of Deuterium and Oxygen isotopes, cast thin section and scanning electron microscope, the characteristics and origin of formation water and its diagenetic response were studied. The result shows that this formation water is mainly of CaCl2 type, and disassociation of rock salt controls the salinity. Formation parameters reflect a good sealing of Es3 with strong water-rock reaction. The missing of Na^＋＋K^＋, compared with Cl^-, is caused by cation alternative adhesive action, albitization of plagioclase and authigenic illite. Cation alternative adhesive action, albitization of plagioclase and disassociation of evaporite rock and anhydrite cements provide more Ca^2＋, dolomitization and chloritization result in a lack of Mg^2＋. Disassociation of gypsum rock and maturation of organic make the formation water rich in SO4^2-and HCO3^-. Supersaturated CaCO3 and Ca SO4 lead to good development of carbonate and anhydrite cements.
出处
《断块油气田》
CAS
北大核心
2015年第5期594-599,共6页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题"东濮凹陷油气富集规律与增储领域"(2011ZX05006-004)
中央高校科研专项资金(10CX04009A)
关键词
地层水特征
地层水成因
水岩反应
成岩响应
文东地区
characteristics of formation water
origin of formation water
water-rock reaction
diagenetic response
Wendong Area
