准噶尔盆地南缘中段喀拉扎组成岩相类型及优质储层主控因素  

Diagenetic facies types and main controlling factors for the high quality reservoirs of the Kalazha Formation in the middle part of the southern margin of Junggar Basin

作　　者：司振宇 朱锐[1] 袁波[2] 冀冬生[2] 唐雪颖 赵格尔 SI Zhenyu;ZHU Rui;YUAN Bo;JI Dongsheng;TANG Xueying;ZHAO Geer(School of Geosciences,Yangtze University,Wuhan,Hubei 430100,China;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Urumqi,Xinjiang 830013,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国石油新疆油田分公司勘探开发研究院,新疆乌鲁木齐830013

出　　处：《东北石油大学学报》2024年第6期1-16,I0001,I0002,共18页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(42130813)。

摘　　要：准噶尔盆地南缘中段储层获得高产油气流,油气勘探潜力巨大,但优质储层主控因素不明确。采用薄片鉴定、扫描电镜和物性测试等方法,结合测、录井等钻井资料,分析盆地南缘中段喀拉扎组储层成岩作用类型、强度及其演化特征,明确优质储层的主控因素。结果表明:喀拉扎组储层主要发育岩屑砂岩,成分成熟度低,结构成熟度中等,储集空间以残余粒间孔为主。喀拉扎组储层受沉积因素、成岩相及地层温压条件控制,沉积作用是优质储层发育的基础,成岩作用是储层改造的关键因素。储层可划分为中压实—弱胶结相、中压实—中胶结相、中压实—强胶结相和强压实致密相4种成岩相,其中中压实—弱胶结相物性最好,为最有利储层,主要发育于水下分流河道微相;中压实—中胶结相物性次之,主要发育于河口坝微相;中压实—强胶结相和强压实致密相物性最差,为非储层。异常高压和持续降低的地温梯度有效降低压实作用的影响,也是储层物性保存的重要因素。该结果为研究区下一步的勘探开发提供指导。The southern margin of the Junggar Basin has the potential for oil and gas exploration,as evidenced by the high flow of oil and gas in the Kalazha Formation reservoirs of its middle section.However,the factors responsible for the high-quality reservoirs are still unclear.By analyzing and testing methods such as thin section identification,scanning electron microscopy,and physical property testing,combined with drilling data such as logging data,the diagenetic process types,intensity,and evolutionary characteristics of the Kalazha Formation reservoir in the middle section of the southern margin are analyzed.And the controlling factors of high-quality reservoirs are identified.The results show that Kalazha Formation mainly consists of lithic sandstone with low compositional maturity and medium structural maturity,with residual intergranular pores dominating the reservoir space.The reservoirs of the Kalazha Formation are controlled by sedimentary factors,diagenetic facies,and lithostatic pressure-temperature conditions,sedimentation is the foundation for the development of high-quality reservoirs,diagenesis is the key factor in reservoir modification.Four diagenetic facies can be identified and classified within this section:medium-compaction and weak cementation,medium-compaction and medium cementation,medium-compaction and strong cementation,and strong-compaction and dense.The medium-compaction and weak cementation facies had the best physical properties and was the most favorable reservoir,it was mainly developed in the underwater distributary channels microfacies.The medium-compaction and medium cementation facies had the second-best physical properties and was mainly developed in the mouth bars microfacies.On the other hand,the medium-compaction and strong cementation and strong-compaction and dense facies had the worst physical properties and were non-reservoirs;anomalously high pressure and a sustained decrease in geothermal gradient effectively reduce the impact of compaction and are important factors in pre

关 键 词：成岩相 成岩作用 储层控制因素 喀拉扎组 准噶尔盆地南缘 

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]