【作者】 李娜；

【导师】 孟元林； 肖丽华；

【作者基本信息】 大庆石油学院 ， 矿产普查与勘探， 2009， 硕士

【摘要】 本文在前人成岩作用研究的基础上,完善了成岩作用数值模拟和成岩相预测的软件系统,完成了辽河西部凹陷双清地区的成岩作用数值模拟和成岩相预测;综合考虑沉积微相和成岩作用对孔隙度的影响,建立了该地区不同沉积微相储层孔隙度与成岩指数的相关模型,预测了储层的孔隙度,并确定了有效储层的分布范围。研究表明,各层段的油气藏主要形成时期与成岩作用密切相关,不同层位主成藏期次不同。沙四段在沙一期进入中成岩阶段A2亚期,油气藏开始大规模形成,沙三段的主成藏期在Es1～Ed,沙一、二段则在Ed～现今这段时间内。各层的成岩强度均有从凹陷边部到凹陷中心(也就是从NW到SE方向)逐渐增强的趋势,并随着成岩强度的增加从凹陷边部到中心有规律地发育一系列的成岩相;在纵向上,同一地区从上到下成岩阶段逐渐增强,并依次发育一定的成岩相。双清地区沙一段储层成岩作用较弱,全区储层孔隙度大于工业天然气储层的孔隙度下限(5.8%),砂体均为有效储层;沙二段大部分地区孔隙度>5.8%,仅在工区东南部有小部分孔隙度低于5.8%,有效油气储层和有效天然气储层约占全区的50%;沙三段仅在斜坡带发育孔隙度大于5.8%的有效油气储层,面积约占工区面积的30%;沙四段成岩作用最强,仅在工区北部发育有效油气和有效油气储层和有效天然气储层,面积约占全区1/4。更多还原

【Abstract】 On the base of predecessors’findings of diagenesis, the article has pefected the diagenesis numerical simulation and prognostic diagenetic facies oftware system, and completed the diagenesis numerical simulation and the prevision of diagenetic facies in the territory of ShuangQing in The west of LiaoHe sag. The sediment microfacies and diagenesis have an effect on porosity, which is integrative considered in this article. Also, the author have established the correlation model of the reservoir porosity with different sediment microfacies and diagenesis indices, and forcasted the reservoir porosity and ascertained the distribution of valid reservoir. The research has manifested that the principal forming time of oil-gas reservoir of each interval have a closely relate to each other to the diagenesis, and different horizon correspond to different time and order of forming researvoir. The oil-gas reservoir began to form extensively when Es1 entered mid-diagenetic stage A2 substage in Es4, the Es3 main age of forming hydrocarbon-bearing pool was on Es1～Ed, while Es1 and Es2 that age was during the time of Ed～nowadays.Each layered diagenesis intensity represents the trend that the intensity become enhance gradually, and the layer upgrowths regularly a series of diagenetic facies with the increase of diagenesis intensity from the fringe of sag to the center (I.E. from NW to SE in the sag). At highly asymmetrical logitudinal, the diagenetic stage of same territory crescendos from the top to bottom,taking turns to develop certain diagenetic facies.The diagenesis of Es1 reservoir is relatively poor in ShuangQing territory, and porosity of the whole district reservoir greater than porosity cutoff(5.8%)of industrial gas reservoir,all ore mass is effective reservoir; Only does porosity of a small part of area in sag is lower than 5.8%,the porosity of other area in Es2 exceed 5.8%,and both effective reservoirs for oil and gas and valid gas reservoir cover the proportion of about 50% in full regional; Es3 develops the valid oil-gas reservoirs in which the porosity is over 5.8% only in ramp region, and the area is approximately 30% work area. the diagenesis in Es4 is most intensive ,there is effective oil gas, valid reservoirs for oil and gas and gas reservoir only in the north of work area, the area is about a quarter of full section.更多还原