论文部分内容阅读
为了研究断裂在油气成藏中的作用,在断裂封闭能力有效性和时间有效性及其影响因素研究的基础上,通过比较断层岩排替压力与其下储层剩余压力的相对大小和断裂封闭能力形成时期与源岩生排烃高峰期相对早晚,分别建立了一套断裂封闭能力有效性和断裂封闭时间有效性研究方法,并将其应用于渤海湾盆地南堡凹陷南堡5号构造NP5-2断裂在9条测线处东二段泥岩盖层内封闭能力有效性和时间有效性的研究中,结果表明:NP5-2断裂除了在L6和L7测线处封闭能力有效性差之外,其余测线处封闭能力有效性均好,有利于其下天然气的聚集和保存。NP5-2断裂封闭能力形成时期均晚于沙三段和沙一段源岩二次生排烃高峰期,封闭时间有效性差,不利于封闭沙三段和沙一段源岩生排出的天然气,与目前南堡5号构造东二段泥岩盖层之下有天然气聚集但不富集的情况相吻合,表明该方法用于研究断裂封闭能力有效性和时间有效性是可行的。
In order to study the role of faults in hydrocarbon accumulation, based on the study on the validity of fracture sealing ability and its time-effectiveness and its influencing factors, by comparing the relative sizes of fault-rock replacement pressure with the residual reservoir pressure and fracture sealing ability In the formation period and the relative peak of source rock hydrocarbon expulsion and hydrocarbon generation relatively early and late, a set of effective methods for studying the validity of fracture sealing ability and fracture sealing time were established, and applied to the construction of NP5-2, Nanpu 5, Nanpu Sag, Bohai Bay Basin In the study of the sealing ability and the time validity of the fault in the mudstone caprocks of the second member of the 9th line, the results show that except for the effectiveness of the sealing ability of the NP5-2 fault at the line L6 and L7, The effectiveness of the sealing capacity at the line is good, which is conducive to the accumulation and preservation of natural gas under it. The sealing time of NP5-2 was later than the peak of secondary hydrocarbon expulsion in the source rocks of the 3rd member and the 1st member of Shahejie Formation. The closure time was not effective, which hindered the closure of the natural gas from the source rocks of the Shasan Member and the Shayuan Member. It is consistent with the fact that the gas accumulation but not enrichment under the caprock of East Second Member shows that it is feasible to study the validity of fracture sealing ability and time validity.