准噶尔盆地沙湾凹陷百口泉组致密砂砾岩储层特征及主控因素分析

Characteristics of Tight Conglomerite Reservoir and Main Controlling Factors of Baikouquan Area in Shawan Sag of Junggar Basin

利用岩心、测井、铸体薄片和扫描电镜等资料,对沙湾凹陷三叠系百口泉组(Tb)的储层特征及其主控因素进行研究。认为研究区储集岩类主要为砂砾岩、砂质砾岩,其次为细砂岩;岩石的成分成熟度、结构成熟度均较低;储层总体属于中低孔-低渗储层;Tb成岩作用较强,处于早成岩阶段B期-晚成岩阶段A期,储集空间以残余粒间孔隙与次生溶蚀孔隙为主;影响Tb储层的关键因素为沉积作用,而成岩作用则是控制储层的主要因素。通过对该储层物性特征和主控因素的分析,可为致密砂砾岩优质储层的评价与开发提供借鉴。

By using core,logging,cast thin section and scanning electron microscope data,the reservoir characteristics and their main controlling factors of Triassic Baikouquan Formation(Tb)of Shawan Depression were studied.The reservoir type in the study area was mainly of sand shale and sandy conglomerate,followed by fine sandstone,the rock maturity and its structural maturity were lower,the reservoir belonged to a mid-low porosity and permeability reserve.The diagenesis was strong in the study area,it was in the early diagenetic Stage B and late diagenetic Stage A,reservoir spaces were mainly of residual intergranular pores and secondary pores;the deposition was the key factor affecting the Baikouquan Reservoir.And the diagenesis was the main factor controlling reservoir.Through analyzing the characteristics and the main controlling factors of the reservoir,it can provide reference for the evaluation and development of the high quality tight sandstone reservoirs.