塔西南寒武系—奥陶系斜坡带特征与油气成藏条件分析  

Hydrocarbon Accumulation Conditions and the Cambro-Ordovician Platform Edge Slope in the Southwest Tarim Area

作　　者：杨紫[1] 贾承造[1] 潘校华[1] 樊太亮[2] 高志前[2] 袁圣强[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国地质大学能源学院,北京100083

出　　处：《地质科技情报》2014年第4期159-164,共6页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41102087);国家"973"计划项目(2012CB214802)

摘　　要：综合利用露头、岩心及地震资料,剖析了塔西南寒武系-奥陶系碳酸盐岩台缘斜坡带的发育特征及其迁移变化规律,在此基础上,揭示了该区寒武系-奥陶系烃源岩、储层与盖层的匹配关系,并分析了有利的成藏组合。结果表明:塔西南寒武系-奥陶系发育优质烃源岩且油源充足,台缘沉积相带以及台地内部发育多种类型的碳酸盐岩优质储层,加之优越的盖层封闭条件和良好的油气运移通道,在研究区内形成了上部、中部和下部3套成藏组合。塔西南寒武系-奥陶系台缘斜坡带的礁滩体沉积、下斜坡带的滑塌体沉积、台地内的深埋白云岩以及不整合面附近的缝洞型碳酸盐岩均为储集性能良好的潜在储层,其中,中部成藏组合由于储层最发育,且可以兼顾来自下伏的中下寒武统与上覆的上奥陶统烃源岩所生成的油气,是塔西南最具勘探开发前景的成藏组合。In order to deepen the petroleum geological understanding in the Southwest Tarim area,based on outcrops,cores,and seismic data,this research analyzed the characteristics of the Cambro-Ordovician platform edge slopes and their migration regularity,revealed the matching relationship between reservoirs,source rocks,and cap rocks,and finally discussed the potential plays in the study area.Results show that：with rich hydrocarbon source rocks,the petroleum source was sufficient;various types of high-quality carbonate reservoirs developed in the Cambro-Ordovician platform edge slope as well as the platform;the existence of sufficient cap rocks as well as regionally developed excellent migration pathways ensure the potential for large scale hydrocarbon accumulations,and formed three plays in the Southwest Tarim area.The reef-bank complexes deposited in the Cambrian-Ordovician platform edge slope,the gravity flow deposited in the lower slope,dolomites in the platform,and the fracturevug carbonates near the unconformities were high potential reservoirs.In which,the middle play was the most potential play in the study area,because it had the most developed reservoirs and captured the petroleum from the underlying Middle-Lower Cambrian and the overlying Upper Ordovician source rocks.

关 键 词：塔西南 碳酸盐岩 斜坡带 油气成藏条件 成藏组合 

分 类 号：P618.13[天文地球—矿床学]