鄂尔多斯盆地直罗油田水磨沟地区长8储层及含油性特征  

Reservoir and oil-bearing characteristics of Chang 8 reservoir in Shuimogou area,Zhiluo oilfield,Ordos Basin

作　　者：徐宁[1] Xu Ning(YanChang Oil Field Co.Ltd.,All Rights Reserved,Shanxi 727500)

机构地区：[1]延长油田股份有限公司富县采油厂,陕西延安727500

出　　处：《石化技术》2021年第10期134-135,共2页Petrochemical Industry Technology

摘　　要：直罗油田水磨沟区三叠系延长组长8油藏资源潜力较大,但非均质性强,油藏富集规律复杂,为了阐明储层及含油性特征,以直罗油田水磨沟地区长8储层为例,综合运用粒度分析、铸体薄片、扫描电子显微镜、压汞法和常规物性分析,并结合岩心和测井资料进行宏观印证。结果表明:长8储层以细砂岩、粉细砂岩和粉砂岩为主,砂岩碎屑组分中主要矿物成分为长石,占37%~61%,平均51.3%,次为石英,占15%~37%,平均23.5%;岩屑含量1%~16%,平均5.5%。储层主要有溶解作用、交代作用和破裂作用,可增大储层的孔隙度、提高储层渗透率的成岩作用。储层原生孔隙主要发育剩余粒间孔隙,包括石英、长石次生加大后的剩余粒间孔隙以及长石及胶结物颗粒被局部溶蚀而产生的次生孔隙。长8油层组油藏受岩性控制作用明显,属岩性油藏。ShuiMoGou area yanchang group 8 straight ROM oilfield reservoir resource potential is bigger,but the strong heterogeneity,complex reservoir enrichment regularity,to clarify the reservoir and oil content characteristics,with long straight ROM oilfield ShuiMoGou area 8 reservoir as an example,the integrated use of mechanical analysis,the casting thin sections,scanning electron microscope(sem),mercury intrusion method and conventional petrophysical analysis,The core and well logging data were combined to carry out macroscopic verification.The results show that the Chang 8 reservoir is mainly composed of fine sandstone,fine siltstone and siltstone.The main mineral composition of the sandstone detrital components is feldspar,accounting for 37%~61%,with an average of 51.3%,and quartz,accounting for 15%~37%,with an average of 23.5%.The cuttings content is 1%~16%,with an average of 5.5%.Reservoir mainly has dissolution,metasomatism and fracture,which can increase reservoir porosity and permeability of diagenesis.Primary pores in the reservoir mainly develop residual intergranular pores,including residual intergranular pores after secondary enlargement of quartz and feldspar and secondary pores caused by partial dissolution of feldspar and cement particles.The reservoir of Chang 8 oil layer is obviously controlled by lithology,so it belongs to lithologic reservoir.

关 键 词：储层特征 含油性 延长组 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学]