准噶尔盆地南缘乌鲁木齐一带芦草沟组含油气差异性分布及控制因素分析  

Differential Hydrocarbon Distribution and Its Control Factors of Lucaogou Formation in Urumqi,Southern Margin of Junggar Basin

作　　者：雷国明[1,2] 梁斌 史美超[2] Lei Guoming;Liang Bing;Shi Meichao(Geology and Mineral Resources Office,Xinjiang Bureau of Geological and Mining Resources,Urumqi,Xinjiang,830000,China;NO.9 Geological Party,Xinjiang Bureau of Geological and Mining Resources,Urumqi,Xinjiang,830000,China)

机构地区：[1]新疆地质矿产勘查开发局地质矿产(科技外事)处,新疆乌鲁木齐830011 [2]新疆地质矿产勘查开发局第九地质大队,新疆乌鲁木齐830000

出　　处：《新疆地质》2020年第4期516-522,共7页Xinjiang Geology

基　　金：新疆维吾尔自治区科技人才培养基金项目(QN2016YX0643);新疆维吾尔自治区地质勘查基金项目(N16-2-LQ28)联合资助。

摘　　要：以钻探、地质综合测录井、核磁共振测井、电成像测井技术及实验测试为手段,以沉积学、有机地球化学、岩石矿物学、储层特征研究为重点,开展准噶尔盆地南缘冲断带东段乌鲁木齐一带芦草沟组页岩含油气差异性研究,探讨主要控制因素,旨在为进一步优选勘探区块和预测页岩油气可采资源量提供地质依据。结果表明:芦草沟组含油气差异性受多种因素控制,构造活动形成的溶蚀缝为油气聚集提供了有利储集空间,同时控制芦草沟组油气运聚;油气藏发育程度与富有机质页岩厚度(H)、有机碳(TOC)含量呈正相关;靠近乌鲁木齐向斜核部裂隙较发育,以页岩油层为主,有利储层为上段富有机质页岩层和碳酸盐岩层,有利储集空间为溶蚀孔洞和构造裂隙,油层含油饱和度与微裂缝发育程度呈正相关;向斜东南翼裂隙不发育,以页岩气层为主,有利储层为上段富有机质页岩层系,有利储集空间为有机质生、排烃后的残留、残余微孔,页岩气层规模与微裂缝发育程度相关性不明显。Based on the results of the drilling,geological comprehensive logging,comprehensive logging,nuclear magnetic resonance logging,electrical imaging logging technology and experimental testing,focusing on Sedimentology,Organic Geochemistry,Petrology,Mineralogy and Reservoir Characteristics.The oil-gas differential distribution of Lucaogou Formation in the eastern section of the thrust belt in the southern margin of Junggar basin is carried out,and the main controlling factors are discussed for further study,which provided important geological basis for optimizing exploration blocks and predicting recoverable resources of shale oil and gas.The results show that the differences of oil and gas in Lucaogou Formation are controlled by many factors.The dissolution fractures formed by tectonic activities provide favorable reservoir space for oil and gas accumulation,which also control the oil and gas migration and accumulation in Lucaogou Formation.The development degree of oil and gas reservoir is positively related to the thickness(H)and TOC content of organic shale;the fractures near the core of Urumqi syncline are relatively developed,mainly shale oil layer,and the favorable reservoir is the organic shale rich shale,carbonate rock and silty dolomite in the upper part of Lucaogou Formation,and the favorable reservoir space is dissolution hole and structural fracture,There is a positive correlation between the oil saturation and the development degree of microfractures.The fractures in the southeast wing of syncline are not developed,mainly shale gas reservoir.The favorable reservoir is the organic rich shale series in the upper segment of Lucaogou Formation.The favorable reservoir space is the residual and residual micropores after hydrocarbon generation and expulsion of organic matter.The correlation between the scale of shale gas reservoir and the development degree of microfractures is not obvious.

关 键 词：准噶尔盆地南缘 芦草沟组 页岩油气层 油气差异性 

分 类 号：P618.12[天文地球—矿床学]