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辽河坳陷西部凹陷油气资源十分丰富,其中稠油约占总储量的68%。对该区稠油地球化学特征进行综合分析,认为其成因主要包括生物降解作用、水洗氧化和油气运移过程中的轻质组分散失。油藏类型主要为构造、地层、潜山及复合型稠油油藏,平面上主要分布于凹陷东西两侧斜坡的中上台阶。稠油分布受主干断裂发育、有利构造岩相带、区域不整合、盖层发育特征等因素的控制。通过整体构造形态落实及构造演化史分析、沉积微相和储层展布研究、不整合面封堵性分析,确定潜在稠油油藏的分布范围,实现稠油的深化勘探。
The western sag of Liaohe Depression is rich in oil and gas resources, of which heavy oil accounts for about 68% of the total reserves. The comprehensive analysis of the geochemical characteristics of heavy oil in the area shows that the major causes include biodegradation, washing and oxidation, and the loss of light components during hydrocarbon migration. The main types of reservoirs are structural, stratigraphic, buried hill and complex heavy oil reservoirs. The main types of reservoirs are mainly located on the upper and middle steps of the slopes on both east and west sides of the depression. Heavy oil distribution is controlled by such factors as the development of main faults, favorable structural lithofacies, regional unconformity and the characteristics of the caprock. Through the overall structural morphology and structural evolution history analysis, sedimentary microfacies and reservoir distribution studies, unconformity surface sealing analysis to determine the distribution of potential heavy oil reservoirs, to achieve the deepening of heavy oil exploration.