准南缘柴窝堡与吐哈西北缘大河沿早二叠世构造沉积特征及油气勘探启示  

Tectonic-Sedimentary Characterization and Hydrocarbon Exploration Implication of Chaiwopu in the Southern Margin of Junggar Basin and Daheyan in the Northwestern Margin of Tuha Basin

作　　者：刘慧[1] 张金亮[2] 赵乐强[1] Liu Hui;Zhang Jinliang;Zhao Leqiang(Sinopec Shengli Oilfield Branch Company,Dongying,Shandong 257000,China;Beijing Normal University,Beijing 100875,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257000 [2]北京师范大学,北京100875

出　　处：《特种油气藏》2020年第3期14-20,共7页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-002);“准噶尔盆地及周缘泥页岩沉积层序特征”(2017ZX05036001-002)。

摘　　要：柴窝堡与大河沿地区位于准噶尔盆地南缘和吐哈盆地西北缘结合部位,针对该区早二叠世盆地属性争议问题,依据前人研究基础,开展野外地质调查,从沉积学角度进行碎屑组分及地球化学元素分析。研究表明:柴窝堡与大河沿地区早二叠世构造背景为活动大陆边缘和岛弧,其中,准南缘柴窝堡下二叠统发育海相复理石建造,可见浊流沉积的鲍马序列;而吐哈西北缘大河沿下二叠统主要为陆相冲积扇-扇三角洲相沉积,在大河沿后沟剖面可见到盆地边缘相沉积,推测为早二叠世吐哈盆地西北缘边界。综合认为,准噶尔盆地与吐哈盆地在早二叠世已具有分割性。根据沉积特征分析,柴窝堡与大河沿区块均具有形成良好生储盖组合的沉积背景,柴窝堡区块易形成岩性油气藏,而大河沿区块易形成地层-岩性油气藏,二者勘探的关键是要落实优质的砂岩储集体。该研究不仅对研究区构造沉积环境认识提供了佐证,对该区油气勘探也具有一定的启示作用。Chaiwopu and Daheyan are located in the joint part between the southern margin of Junggar Basina and the northwestern margin of Tuha Basin.In order to clarify the Early Permian basin attribute in this area,field geological survey was conducted to analyze the clastic components and geochemical elements from a sedimentological perspective based on the previous understandings.Research indicates that the Early Permian tectonic setting of Chaiwopu and Daheyan is considered as active continental margin and island arc.There is marine flysch structure in the Lower Permian Chaiwopu of the southern Junggar Basin margin,and it is observed as Bouma sequence of turbidity deposit.The Lower Permian Daheyan in the northwestern margin of Tuha Basin is dominated from continental alluvial fan fan delta facies.Basin marginal facies deposition can be observed in the Hougou cross section of Daheyan,and it is presumed to be the northwestern margin of Tuha Basin in the Early Permian.It is comprehensively believed that the Junggar Basin and Tuha Basin have been divided in the Early Permian.According to the sedimentary analysis,the both Chaiwopu and Daheyan show a favorable depositional setting for source-reservoir-caprock combination.Chaiwopu is prone to form lithologic reservoir,while the Daheyan is prone to form stratigraphic-lithologic reservoir.The key point to these two zone explorations is to identify high-quality sandstone reservoir.This research could not only provide evidence for the tectonic-sedimentary environment understanding,but also presents certain enlightenment for the hydrocarbon exploration in this area.

关 键 词：准南缘柴窝堡 吐哈西北缘大河沿 早二叠世 盆地属性 沉积特征 储集体 

分 类 号：TE122.2[石油与天然气工程—油气勘探]