松辽盆地情南-黑帝庙次凹青山口组储层成岩作用研究

利用薄片鉴定、扫描电镜、包裹体测温及压汞分析等手段, 进行了储层岩石学特征、成岩作用类型、成岩阶段和成岩演化模式研究。研究区储层岩石类型为细粒2粗粒长石岩屑砂岩和岩屑长石砂岩, 砂岩经历了机械压实压溶、化学胶结、交代、溶蚀和黏土矿物转化等成岩作用。依据成岩标志, 研究区青山口组处于晚成岩期A2-A3亚期。成岩演化模式表明: 嫩二、三段沉积时, 青一段处于晚成岩A1期, 青二、三段处于早成岩B亚期-晚成岩A1亚期; 明水期, 青山口组整体处于晚成岩A2 亚期; 古近纪, 青一段进入晚成岩A3亚期, 青二、三段中上部处于晚成岩A2亚期。

Research on reservoir diagenesis of Qingshankou Formation in Qingnan-Heidimiao secondary depression , Songliao Basin

Utilizing sides identification, scanning electron microscope ( SEM) , inclusion temperature meas2 urement and mercury penetration analysis, the authors study the petrological characteristic of reserviror, diagenesis type, diagenesis stage and model of diagenesis evolution. The rocks of the reserviror in the studied area are fine2 coarse feldspathic lithic sandstone and lithic feldspathic sandstone in type, and the sandstone experienced the diag2 nesis ofmechanical compaction and p ressolution, chemical bond, alternation, corrosion and claymineral inversion. According to the diagenesismarks, the Qingshankou Formation belongs to A2-A3 substages of late diagenesis stage. The model of diagenesis evolution indicates that during the deposit of the Members2nd-3rd ofNenjiang Formation, the Member1 st of Qingshankou Formation is at the A1 substage of late diagenesis stage, and theMembers2nd-3rd of Qingshankou Formation are at the B substage of early diagenesis stage and A1 substage of late diagenesis stage; during theMingshui Formation, the whole Qingshankou Formation is at the stage of A2 substage; while in Paleocene, the Member1st of Qingshankou Formation goes into the A3 substage of the late diagenesis stage, and the middle and upper parts of the Member2nd-3rd of the Qingshankou Formation are at the A2 substage of late diagenesis stage.