苏北盆地海安凹陷阜三段油气成藏控制因素分析

发布时间：2019-01-10 12:35

【摘要】：近年来,苏北盆地海安凹陷曲塘次凹阜三段勘探不断取得新发现,相继发现张家垛及曲1块等油藏,进一步展示出该套层系良好的勘探前景。通过对海安凹陷阜三段典型油藏解剖及油气分布特征分析,认识到阜三段油气富集主要受良好的构造背景、源—储—盖配置及异常高压条件控制。进一步研究认为:烃源岩演化差异是造成次凹间阜三段油气发现贫富差异的根本原因;长期持续活动的油源断层对阜三段成藏起到重要作用;砂体展布及地质结构空间的合理配置有利于在南部次凹斜坡形成断层—岩性、砂岩上倾尖灭等类型隐蔽圈闭。在此基础上,指出海安凹陷除曲塘次凹外,北部孙家洼次凹、丰北次凹及富安次凹近凹地区阜三段成藏条件配置较为有利,以寻找构造油藏为主;南部新街次凹和海北次凹砂地比较低,为岩性油藏勘探有利地区。
[Abstract]:In recent years, new discoveries have been made in exploration of the third member of Qutang sub-depression in Haian depression of Subei Basin, and reservoirs such as Zhang Jiadong and qu 1 block have been discovered one after another, which further shows that this set of strata has a good exploration prospect. Based on the analysis of typical reservoir anatomy and oil and gas distribution characteristics of the third member of Fu in Haian Sag, it is recognized that hydrocarbon enrichment in the third member of Fu is mainly controlled by good tectonic background, source-reserve-cap configuration and abnormal high pressure conditions. It is considered that the evolution difference of hydrocarbon source rocks is the root cause of the difference between rich and poor oil and gas discovery in the third member of the secondary depression, and that the long-lasting oil-source fault plays an important role in the reservoir formation of the third member of Fujianjie formation. The distribution of sand bodies and the reasonable allocation of geological structure space are favorable to the formation of fault-lithology and sandstone updip pinning traps in the southern subconcave slope. On this basis, it is pointed out that the reservoir forming conditions of the third member of Fu3 member in Haian sag, except Qutang subconcave, Sunjiawa subconcave, Fengbei subdepression and Fuansubconcave area, are favorable, and the structural reservoir is the main one. The sand land of Xinjie subdepression and Haibei subdepression in the south is relatively low, which is favorable for lithologic reservoir exploration.
【作者单位】：中国石化江苏油田分公司勘探开发研究院;
【基金】：中国石化江苏油田分公司科技项目“海安凹陷E1f3、E2s1油气成藏主控因素及钻探目标研究”(JS12001)
【分类号】：P618.13

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