浅析东海西湖凹陷砂—泥岩协同成岩作用

Analysis of Coordinated Diagenesis of Sandstones and Mudstones in Xihu Sag,East China Sea

随着东海西湖凹陷深层勘探不断深入,深部储层甜点分布的复杂性问题已经日益突出。此文从有机质演化、黏土脱水及转化问题引入"协同成岩"概念,综合分析有机质及黏土演化过程中的几种重大成岩事件,分析有机质热演化过程产生的有机酸、CO_2以及油气对储层成岩环境的影响,探讨泥岩成岩后生过程中,黏土脱水、转化与储层之间产生的物质交换,试图在砂岩、泥岩的相关检测资料的相互联系中提出新的见解,从而深化储层成岩作用分析,帮助建立可靠的储层预测模型,为深部储层研究开拓思路。

Along with the deep exploration of the Xiht/Sag in East China Sea, the complexity of deep sweet reservoir distribution has become increasingly prominent. From organic matter evolution, clay dehydration and the conversion problem, the concept of coordi- nated diagenesis has been introduced in this paper. Through integrated analysis about organic matter and the clay evolution process in several major diagenetic events, the influence of organic acid, CO2, and hydrocarbons generated during thermal evolution process of organic matters on reservoir diagenetic environments has been analyzed. In addition, study has been conducted on clay dehydration, transformation and material exchange between the reservoir during the process of the epigenetic, trying to find the relationship from testing data of sandstones and mudstones and put forward some new ideas in order to deepen the analysis of reservoir diagenesis, and help to establish a reliable reservoir nr,~rli/-~ir,,, ,-~A^I ~~ ,4 ：- L ,