摘要
通过对川东—渝北地区石炭系黄龙组储层的成岩作用方式、成岩演化序列和相对应的地质作用产物、组合及稀土元素和碳、氧、锶稳定同位素地球化学特征的综合研究,按"水文体制"将黄龙组划分为不同成岩阶段的孔隙水、压实卤水、大气水和温压水4个成岩系统。各成岩系统流体来源、性质、水-岩石相互作用过程及其对储层的影响各不相同,其中与储层发育密切相关的成岩体系和成岩方式主要为:早成岩阶段压实卤水成岩系统的埋藏白云岩化作用;古表生期大气水成岩系统的岩溶作用;再埋藏成岩阶段温压水成岩系统的深部溶蚀和构造破裂作用。根据成岩系统和水-岩石相互作用序列与储层演化在时间-空间上的耦合匹配关系,颗粒滩沉积微相控制了储层的区域分布位置;早成岩阶段埋藏白云岩化形成了储层发育基础;古表生期大气水溶蚀作用扩大了储层分布范围、发育规模和提高了储层质量;温压水条件下的深部溶蚀和构造破裂作用进一步改善了储层的孔渗性。
The diagenetic manner and evolution stage as well as the corresponding geologic products and geochemistry characteristics of REE,carbon,oxygen and strontium stable isotope of Huanglong Formation in the area of East Sichuan to North Chongqing were comprehensively studied.According to the ＂hydrological system＂,four diagenetic systems in Huanglong Formation were divided into pore water,compaction brine,atmosphere water and temperature-pressure water.When the source and property of fluid flow and the interaction process between fluid and rock of each diagenetic system are different,the effects of them to the reservoir development are various.So,the diagenetic systems and manner of diagenesis closely related with the reservoir development mainly include the role of burial dolomitization of compaction brine at the early diagenetic stage,the karstification of atmospheric water at the ancient epigenenesis,the role of tectonic disruption at the middle to late re-buried diagenetic stage.According to the coupling and matching relations between diagenesis and reservoir system in time and space,there are four control factors and patterns for reservoirs.The particles shoal of sedimentary microfacies controlled the distribution of location regional of reservoir.The early stage of burial diagenesis dolomite was the basis for developing Huanglong Reservoir.The dissolution of atmospheric water in ancient epigenenesis expanded the distribution of reservoir and the scope of the development scale and improved the quality of reservoir.The tectonic disruption further improved the reservoir porosity and permeability.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2010年第2期237-245,共9页
Acta Petrolei Sinica
基金
中国石油天然气股份有限公司科技项目"四川盆地石炭系油气地质综合研究与有利区带优选"(2008D-0704-04)部分成果
关键词
川东-渝北
上石炭统
黄龙组
碳酸盐岩储层
成岩系统
白云岩化
古岩溶
地球化学特征
East Sichuan to North Chongqing area Upper Carboniferous Huanglong Formation carbonate reservoir diagenetic system dolomitization ancient karst geochemistry characteristics
