演武—彭阳地区长8储层特征及其主控因素研究  

Characteristics and main controlling factors of Chang8 reservoir in Yanwu-Pengyang Area

作　　者：郝子眉 肖晖 曾滨鑫 宋渊博 HAO Zimei;XIAO Hui;ZENG Binxin;SONG Yuanbo(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]陕西省油气成藏地质学重点实验室,西安710065

出　　处：《非常规油气》2024年第3期67-76,共10页Unconventional Oil & Gas

基　　金：陕西省教育厅重点研究计划项目“高-过成熟度烷烃气碳同位素倒转成因分析——以鄂尔多斯盆地靖边气田为例”(17JS109)。

摘　　要：为进一步明确演武—彭阳地区长8储层的勘探开发前景,需对储层的基本特征及其主控因素展开系统研究。通过综合分析演武—彭阳地区各类镜下照片及高压压汞等资料,并结合研究区沉积相展布和成岩作用分析,在明确储层的岩石学特征及物性特征的基础上,定性定量表征研究区储层的主控因素。结果表明:1)研究区长8储层岩性主要为岩屑长石砂岩和长石砂岩,碎屑颗粒多为细-中粒级和极细-细粒级,分选性以中-好为主,磨圆度较差,具有成分成熟度偏低和结构成熟度中等偏高的特点;2)研究区长8储层平均孔隙度为14.52%,平均渗透率为6.20 mD,总体表现为低孔特低渗特征。粒间孔和长石溶孔为主要储集空间,孔喉结构多为中小孔或小孔细喉,具较好分选性;3)研究区内沉积因素、成岩因素和构造-热演化相互联系,共同控制着演武—彭阳地区长8油层组的储层物性。It is important to systematically study the reservoir’s basic characteristics and main controlling factors to further clarify the exploration and development prospects of Chang8 reservoir in Yanwu-Pengyang area.All microscope photos,high pressure mercury injection parameters,and other data in Yanwu-Pengyang area were comprehensively analyzed,and the sedimentary facies distribution and diagenesis in the study area were combined.Then,the petrological and physical characteristics of the reservoir were clarified,and the main controlling factors in the study area were qualitatively and quantitatively characterized.The results show that:1)The lithology of Chang8 reservoir in the study area is mainly lithology of feldspar lithology sandstone and feldspar sandstone;the clastic particles are mostly fine to medium-grained and very fine to fine-grained,with a mainly medium to good sorting and a poor round,which are characterized by low compositional maturity and moderately high structural maturity.2)Porosity of Chang8 reservoir in the study area averages 14.52%,and permeability averages 6.20 mD,which shows a low porosity and particularly low permeability reservoir in general.Intergranular pores and feldspar-dissolved pores are the main storage spaces,and most pores and throats are medium and small pores,or small pores with throats that are thin;and have good sorting ability.3)Sedimentary,diagenesis,and structural-thermal evolution are interrelated in the study area,which jointly control the reservoir physical properties of Chang8 oil formation in Yanwu-Pengyang area.

关 键 词：储层特征 主控因素 长8储层 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]