三塘湖盆地牛圈湖南-马中地区西山窑组一段储层特征及主控因素  

RESERVOIR CHARACTERISTICS AND MAIN CONTROLLING FACTORS OF XISHANYAO FORMATION IN NIUJUANHUNAN-MAZHONG AREA,SANTANGHU BASIN

作　　者：张孝合 徐胜林[1,2] 胡军 李杰[3] 陈安清[1,2] 杨帅[1,2] 王重闲 刘孟琦 呼唤 ZHANG Xiaohe;XU Shenglin;HU Jun;LI Jie;CHEN Anqing;YANG Shuai;WANG Chongxian;LIU Mengqi;HU Huan(State Key Laboratory of Oil and Gas Reservoir Geology and Erploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Research Institute of Erploration&Development,PetroChina Tuha Oilfield Company,Hami,Xinjiang 839009,China)

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学沉积地质研究院,四川成都3610059 [3]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009

出　　处：《矿物岩石》2024年第2期151-160,共10页Mineralogy and Petrology

基　　金：国家自然科学基金(项目批准号:42172132)。

摘　　要：新疆维吾尔自治区东北部三塘湖盆地马朗凹陷牛圈湖南-马中地区中侏罗统西山窑组一段勘探潜力巨大,马朗凹陷具多类型储层特征共生的特点,目前对于牛圈湖南-马中地区储层特征及主控因素研究较少。以牛圈湖南-马中地区西山窑组一段为研究对象,利用490余口井1270件普通薄片、1197件铸体薄片、扫描电镜1197件、49块样品的压汞数据等进行储层特征及主控因素研究。结果表明,牛圈湖南-马中地区西山窑组一段储集砂岩岩性主要为长石岩屑砂岩,其次为岩屑砂岩,填隙物主要为胶结物,胶结物均值4.78%;主要孔隙类型为剩余原生粒间孔,其次为晶间孔和粒间溶孔。储层孔隙度均值12.23%,渗透率4.21×10^(-3)μm^(2)。压汞曲线分选系数均值1.5,最大孔喉半径1.4μm,孔喉分选较差,为小孔隙喉道。沉积微相和成岩作用共同影响储层物性,沉积微相是主控因素,水下分流河道储层物性最好,河口坝微相次之;成岩作用对于储层物性具有两面性,其中压实作用、胶结作用分别平均减少孔隙度19.03%,4.78%,溶蚀作用平均增加孔隙度1.53%。成岩阶段位于早成岩B期至中成岩A期,经历压实作用与胶结作用减孔后,主要由溶蚀作用增加孔隙度,所以可以形成较好储层;研究结果为挑选优势储层提供有效依据。The Malang Sag in the Santanghu Basin of northeast Xinjiang is notable for the coexistence of multiple reservoir types,with the first member of the Middle Jurassic Xishanyao Formation(J_(2)x^(1))in the Niuquanhunan-Mazhong area showing significant exploration potential.Despite this potential,there have been few studies on the characteristics and main controlling factors of the reservoir in this area.This paper investigates the reservoir characteristics and controlling factors of the first member of the Xishanyao For-mation in the Middle Jurassic through the analysis of extensive data from over 490 drilling wells,1,270 thin sections,1,197 cast thin sections,1,197 scanning electron microscopy samples,and 49 sets of mercu-ry compression data collected from the Niuquanhunan-Mazhong area.The results reveal that the reservoir sandstone of the first member of the Xishanyao Formation in the Niuquanhunan-Mazhong area is primarily feldspar lithic sandstone,with lithic sandstone being the secondary type.The average interstitial material content between the clasts is 4.78%,predominantly composed of cements.Diagenetic analysis indicates that the main pore types in the sandstone are residual primary intergranular pores,followed by intergranu-lar pores and intergranular dissolved pores.The average porosity of the sandstone reservoir is 12.23%,and the average permeability is 4.214.21×10^(-3)μm^(2).Furthermore,the sandstone reservoir exhibits poor sor-ting characteristics with small pore throats.The average separation coefficient of the mercury injection curve is 1.5,and the average maximum pore throat radius is 1.4μm.The study of sedimentary facies in-dicates that both sedimentary microfacies and diagenesis significantly impact the physical properties of the sandstone reservoirs,with microfacies being the predominant factor.Among the various microfacies,the underwater distributary channel reservoirs exhibit the best physical properties,followed by the estuarine bar facies.Diagenesis has both positive and negative effects on r

关 键 词：砂岩储层 储层质量 西山窑组一段 三塘湖盆地 

分 类 号：TE122[石油与天然气工程—油气勘探] P534.52[天文地球—古生物学与地层学]