垦利10￣4油田沙三上段成岩作用与油气充注耦合关系

Coupling relationship between diagenesis and hydrocarbon charging in upper 3rd Member of Eogene Shahejie Formation of Kenli 10-4 Oilfield

 赵汉卿 陈存良 陈晓明 张博 刘超

 中海石油（中国）有限公司天津分公司渤海石油研究院，天津 300459

 Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

 综合利用铸体薄片、扫描电镜、流体包裹体等多种分析测试手段，并结合钻测井资料及埋藏史、沉积体系等相关研究成果，详细分析了垦利10￣4油田沙三上段储层成岩作用及油气成藏期次特征。研究结果表明：垦利10￣4油田沙三上段属于高孔、中高渗储层，储集空间仍以原生粒间孔为主，可见次生粒间孔、铸模孔，储层成岩作用总体处于中成岩A期，表现为“中压实、强溶蚀、弱胶结”的特征；沙三上段有机质成熟度处于半成熟—低成熟阶段，是有机酸大量排出阶段，长石及方解石的酸性溶蚀增孔恰好为凹陷内油气的充注提供了空间。研究成果对莱州湾凹陷南斜坡油气勘探具有借鉴意义。

 A detailed analysis of reservoir diagenesis and hydrocarbon accumulation periods of KL 10-4 Oilfield is presented in this paper. The research is delivered by cast thin section, SEM and fluid inclusions analytical methods, furthermore, the drilling/logging data, the burial history as well as other related research results are also taken into consideration. The result shows the reservoir in Es3u of KL 10-4 should be classified to "high porosity and medium-high permeability" reservoir. The reservoir space gives priority to intergranular pore, while secondary intergranular pore and mold hole can be observed. Generally, diagenesis of Es3u reservoir is being functioned in the A period, which is characterized by "medium compaction, strong dissolution and weak cementation". The organics in Es3u are evolving at semi-mature or low mature stage, at which time a large number of organic acids should be expelling. In this way, the acid dissolution and pore enlarging of feldspar and calcite could provide space for hydrocarbon charging. The analysis discussed in this article can give a good reference for oil and gas exploration in the south slope of the Laizhou Bay Depression.

10.6056/dkyqt201804006