低勘探程度盆地勘探技术与评价方法--以玉门探区为例

EXPLORATION TECHNIQUES AND ASSESSMENT METHODS FOR BASINS WITH LOW EXPLORATION MATURITY:A CASE STUDY OF YUMEN EXPLORATION AREA, CHINA

以玉门探区为例,通过对低勘探程度盆地相关资料进行分析,总结出一套针对低勘探程度盆地的勘探技术和评价方法:首先通过综合分析重、磁、电(重力、航磁、大地电磁)资料解析断层特征和盆地构造单元,实现对低勘探程度盆地"定凹选带";然后通过类比已知产油气盆地,选定勘探层系;再通过盆地结构分析、烃源岩反演、钻井资料分析、露头烃源岩质量分析,结合沉积相发育特征,评价盆地资源潜力;最后根据"源控论"和古构造控制油气运聚的理论,开展区带评价与优选研究,并通过分析重力异常,结合地震剖面解释成果最终识别圈闭并优选勘探目标。

A set of exploration techniques and assessment methods suitable for using in basins with low exploration maturity is summarized based on analyses of the relevant data of this kind of basins through a case study of Yumen exploration area. First, to select depressions and structural zones for exploration in basins with low exploration maturity through comprehensively analyzing fault features and structural units with gravity, magnetic, electric data and etc. Then, to define plays through correlation with basins producing oil ang gas. Next, to assess the resource potentials of the basin through analysis of basin architecture, inversion of source rocks, analysis of drilling data, analysis of source rock quality with outcrop data and in combination with the features of sedimentary facies. Finally, to perform evaluation and optimization of plays by using the 'Source Control Theory' and the theory of paleostructure controlling migration and accumulation of hydrocarbons, and to recognize traps and optimize exploration targets through analyzing gravity anomaly and interpreting seismic sections.