准噶尔盆地南缘西段齐古组深层储层特征及物性控制因素  

Deep Reservoir Characteristics and Control of Physical Properties of Qigu Formation in the Western Section of the Southern Margin of Junggar Basin

作　　者：邓毅 高崇龙 王剑[3] 刘明[3] 孟元林[1] 任影 刘可 王柯 DENG Yi;GAO Chonglong;WANG Jian;LIU Ming;MENG Yuanlin;REN Ying;LIU Ke;WANG Ke(College of Geosciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;College of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay,Xinjiang 834000,China;Research Institute of Experiment and Detection of PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [3]中国石油新疆油田公司实验检测研究院,新疆克拉玛依834000 [4]中国石油大学(北京)地球科学学院,北京102249

出　　处：《现代地质》2024年第2期335-349,共15页Geoscience

基　　金：国家自然科学基金青年基金项目(41902118);新疆维吾尔自治区自然科学基金青年基金项目(2022D01B141);黑龙江省博士后基金面上项目(LBH-Z20045)。

摘　　要：准噶尔盆地南缘西段齐古组深层碎屑岩储层油气勘探潜力巨大,但目前针对其储层特征及物性控制因素尚缺乏系统研究,制约了后期油气勘探进程。本文综合利用铸体薄片、扫描电镜、物性、压汞及包裹体等资料,并结合区域埋藏史及古地温等相关成果,对齐古组储层岩石学特征、物性特征、成岩作用特征及物性控制因素进行系统研究。结果表明,齐古组储层具有低成分成熟度、高塑性岩屑含量及中等结构成熟度的岩石学特征。尽管储层主体埋深大于3500 m,但储集空间仍以粒间孔为主,平均孔隙度为10.29%,平均渗透率为34.12×10^(-3)μm^(2),总体上属低孔低渗储层,但仍发育部分中-高孔渗储层。储层成岩作用主要有压实作用、胶结作用及溶蚀作用,成岩强度相对较弱,主体处于早成岩B期—中成岩A期,并表现为压实强度中等、胶结物含量较低且晚期发育酸性溶蚀的特征。富石英与长石、贫岩屑以及分选好等特征有利于储层物性的保存,而储层物性损失以压实减孔最为显著,但储层内部绿泥石包壳及中成岩期的酸性溶蚀作用可有效改善储层物性。此外,齐古组地层早期长期浅埋、后期短期快速深埋、地层超压及较低的古地温梯度等因素延缓了储层成岩进程,进而降低成岩作用强度,导致齐古组优质储层得以有效保存。The deep clastic reservoir of Qigu Formation in the western section of the southern margin of Junggar Basin has a great potential for oil and gas exploration.However,there is still a lack of systematic studies on its reservoir characteristics and control of physical properties,which seriously restricts the subsequent oil and gas exploration.With the combination of the relevant studies of regional burial history and paleogeothermal temperature,this paper comprehensively utilized the data of casting thin sections,scanning electron microscopy,physical properties,mercury intrusion and inclusions,and systematically studied the petrological characteristics,physical properties,diagenesis characteristics,and physical property control of the Qigu Formation reservoir.The results show that the Qigu Formation reservoir exhibits the petrological characteristics of low compositional maturity,high plastic debris content,and medium structural maturity.Although the buried depth of the reservoir center is more than 3,500 m,the reservoir space is still dominated by the intergranular pores,with an average porosity of 10.29%and an average permeability of 34.12×10^(-3)μm^(2).In general,it belongs to the category of low porosity and low permeability reservoirs with limited development of some medium-high porosity and permeability reservoirs.The diagenesis of the reservoir mainly includes compaction,cementation,and dissolution,and the diagenesis intensity is relatively weak.The main body is at the early diagenesis(stage B)to middle diagenesis(stage A),and it is characterized by medium compaction intensity,low cement content,and acid dissolution at the late stage.In particular,the characteristics of enriched quartz and feldspar,poor cuttings,and good sorting are conducive to the preservation of reservoir physical properties.

关 键 词：准噶尔盆地南缘 侏罗系 齐古组 储层特征 物性控制因素 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]