姬塬—堡子湾地区长6段成岩作用研究

Diagenesis of Chang 6 Reservoir in Jiyuan-Baoziwan Area

胡圆圆 陈恭洋 胡再元

长江大学地球科学学院，湖北 荆州 434023

School of Geosciences , Yangtze University, Jingzhou 434023, China

通过微观显微镜观察及分析化验等手段对影响研究区储层物性重要的自生矿物的形成进行了探讨，认为姬塬—堡子湾地区上三叠统延长组长6段经历了压实、压溶、胶结及溶解等一系列复杂的成岩作用，成岩现象丰富,特征明显，早成岩期的压实作用和多种矿物的胶结作用是造成本区岩石孔隙体积减小的重要因素，而溶解作用尤其是长石的溶蚀作用是储层物性变好的重要成岩控制因素。

The paper studied diagenesis of authigenous mineral that impacts the physical characteristics of the reservoirs in the study area through the observation by scanning electromic microscope and means of laboratory analysis. It is believed that Chang6 oil-bearing beds underwent a series of complex diagenesis periods such as compaction, cementation, and dissolution. The diagenetic phenomenona are very rich and the diagenetic characteristics are very obvious and complex. The diagenetic processes that control reservoir properties include the mechanic compaction, cementation and dissolution of grains. Compaction and the cementation of many minerals at the early diagenesis are the main factors to cause the reduction of porosity volumes in the area. The dissolution of framework grains at the late diagenesis phase, especially the dissolution of feldspar, is the key controlling factor of diagenesis that changed the porosity characteristics of the reservoirs.