牛庄洼陷沙三中亚段浊积岩储层成岩作用及主控因素分析

DIAGENESIS AND CONTROLLING FACTORS OF THE TURBIDITE RESERVOIR OF SUB-MIDDLE OF THE THIRD MEMBER OF SHAHEJIE FORMATION IN NIUZHUANG SAG

东营凹陷牛庄洼陷沙三中亚段浊积岩储层以长石细砂岩、岩屑细砂岩及粉砂岩为主,结构成熟度及成分成熟度均较低。浊积岩样品的显微特征及成岩矿物的组合关系分析结果表明:该区的浊积岩储层目前主要处于晚成岩A期到B期的过渡阶段,成岩现象包括压实压溶作用、石英的次生加大作用、碳酸盐矿物胶结作用、溶解作用和粘土矿物转化作用等,这些作用过程受矿物与孔隙流体之间的相互作用控制。影响成岩作用的主要因素是岩石性质、沉积微相、水介质的性质、超压、高温以及烃类的早期注入。

Turbidite reservoir of the sub-middle member of the third member of Shahejie formation at the Niuzhuang Sag of Dongying Depression, mainly consist of feldspathic packsand, litharenite and siltstone with low compositional maturity and textural maturity. The micro-characteristics and composite relation between diagenesis minerals of turbidite rock samples has been analyzed. The research result shows that the diagenesis of turbidite rock is in the later diagenetic A and B stage. The diagenesis includs compaction and pressure solution, quartz overgrowth, carbonate mineral cementation, mineral corrosion and clay mineral transformation. The processes of diagenesis are controlled by reciprocity between mineral and porosity fluid. The diagenesis of turbidite rocks were primarily controlled by lithology, sedimentary microfacies, water medium properties, abnormal high pressure, high geothermal field and early hydrocarbon invasion.