豫西地区中古生代构造特征与油气前景评价
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摘要
通过76条测线近2 238 km的地震解释对豫西地区构造特征进行深入研究,该地区断裂复杂,受其影响,油气运聚成藏差异较大,但构造特征对油气有明显控制作用,油气具有南北成带、东西分隔的特征。油气勘探的研究基础往往是区域范围内不同的构造单元,同一构造单元的地质构造、沉积环境特征及油气分布特征相对统一,构造单元划分有利于深化盆地地质认识指导油气勘探。综合利用地震、钻井、钻孔以及地面露头等方面的资料,在分析了豫西地区平面和剖面上断裂体系特征的基础上,主要依据各盆山关系,及各自的构造变形的差异性,将豫西地区分为10个二级构造单元,再由不同构造单元的地质环境及断裂特征,得出油气前景评价的结果,认为伊川冲断-断陷区为当前豫西地区油气勘探最有利的地区,其次是渑池-新安冲断-断块区。上述研究认识为豫西地区油气地质研究及有利勘探区的优选等提供了参考和指导。
The interpretation of 76 seismic survey lines about 2 238 km in the West He'nan region were further studied,that were conduded the tectonic characteristics are complex,in that under their influence,migration and accumulation of oil and gas are different and are obviously controlled by a north-south direction zonal distribution and east-west directional separation characteristics. Hydrocarbon exploration mostly consider some structural units as the basic research targets because they have closer basement,structural,deposit characteristics and similar controlling factors of reservoir-formation,thus it is favorable to guide the exploration direction and deployment on the basis of the division of structural unit. With seismic,drilling,logging data,and outcrop,the West He'nan region is divided into 10 two secondary building unit,mainly based on the analysis of fault system characteristics in plane and section,differences between basins and mountains,as well as their structural deformation,by different tectonic units of geological environment and fracture characteristics of oil and gas and prospect evaluation results,that were concluded Yichuan thrusting faulted zone is the most favorable area for oil and gas exploration,followed by the Mianchi-Xin'an thrusting fault block,which provides reference and guidance for the study of oil and gas geology in western He'nan region and favorable exploration areas of optimization.
引文
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