浊积砂体油气成藏主控因素的定量研究  

Quantitative study on key control factors for reservoir formation in turbidity sand

作　　者：隋风贵[1] 

机构地区：[1]胜利油田有限公司地质科学研究院,山东东营257015

出　　处：《石油学报》2005年第1期55-59,共5页Acta Petrolei Sinica

基　　金：中国石油化工集团公司科技攻关项目(P02084)"东营凹陷中带岩性油藏精细勘探研究"成果。

摘　　要：东营断陷盆地沉积中心广泛发育了浊积砂体,它与烃源岩间存在密切的成生关系,有利于形成岩性油气藏,但对其含油气性难以定量预测。对该地区大量已钻探浊积砂体油气藏特征进行了剖析。在此基础上,结合测试和模拟试验资料分析,对浊积砂体油气成藏的主控因素进行了研究,并给出了定量评价和预测浊积砂体含油气性的相关界限参数。结果表明,浊积砂体围岩的排烃强度是决定砂体成藏的关键因素。在油源充足的情况下,其含油性则主要受砂体的储集属性和成藏动力及阻力条件的影响。其中,围岩排烃强度大于20×104t/km2、且成藏动力指数大于15%时,易于形成高充满度的油气藏;而厚度小于2m、孔隙度小于12%的砂体则不利于成藏。Turbidity sand widely developed in the deposit center of Dongying faulted basin is closely related to source rocks and favorable for forming lithologic reservoir. But it is difficult to quantitatively predict oil-gas-bearing property in turbidity sand. The characters of plentiful reservoir proved to be turbidity sand reservoir by drilling were analyzed. In combination with tested and simulated data, the key factors controlling reservoir-forming in turbidity sand were discussed. A threshold value of relative indexes for evaluating oil-gas-bearing property was given. The results show that expulsion intensity of hydrocarbon in surrounding rock is the most important factor of reservoir-forming. If hydrocarbon resource rock is abundant in turbidity sand, the main factors affecting the oil-gas-bearing property include reservoir property, drive force and resistance force of reservoir-forming. The surrounding rock with an hydrocarbon-expulsion intensity greater than 200 thousands of tons per square kilometer and the dynamic reservoir-forming index greater than 0.15 is favorable for forming the reservoir with high-fullness hydrocarbon, while the turbidity sand with thickness less than two meters and porosity less than 12% is unfavorable for reservoir formation.

关 键 词：东营断陷盆地 浊积砂体 排烃强度 储集属性 成藏动力指数 油气充满度 

分 类 号：TE112[石油与天然气工程—油气勘探]