川中合川—广安地区震旦系灯影组含油气评价

发布时间：2018-03-31 17:47

本文选题：灯影组　切入点：储层　出处：《西南石油大学》2015年硕士论文

【摘要】：四川盆地深层海相碳酸盐岩油气勘探领域已取得较大的突破,川中高石梯-磨溪地区震旦系勘探表明其基本油气地质条件较好、油气资源丰富、勘探潜力好。然而,鉴于灯影组储集层段埋藏较深、成岩作用复杂、成藏规律认识不足及勘探程度低等因素,对高-磨以东的合川-广安地区灯影组储层基本特征、主控因素、发育规律及油气成藏等问题的认识尚不明晰。因此,深化合川-广安地区灯影组储层特征研究、落实其含油气性、扩大勘探场面意义重大。合川-广安地区震旦系灯影组碳酸盐岩以灰色藻云岩、晶粒云岩为主,次为砂屑云岩、溶塌角砾岩。沉积相类型以碳酸盐岩潮坪为主,具体可以划分为浅水台坪和半深水台坪两个相及高能滩、较高能丘、藻丘、低能云坪、低能云泥坪等多个亚/微相。储集空间类型以晶间溶孔、粒间溶孔及裂缝为主,总体属裂缝-孔洞型储层。研究区及邻区灯二段孔隙度为2%～3.5%,渗透率为0.01～0.1mD；灯四段孔隙度主要分布在4.0%～9.0%之间,次为2.5%～3.0%,渗透率为0.1～10mD,总体属低孔、低渗储层。储层主要分布在灯二段及灯四段顶部,灯二段上部储层厚度较大、横向展布较连续,灯四段上部储层横向展布较连续,厚度从西向东逐渐减薄。研究区烃源岩主要以上覆筇竹寺组暗色泥页岩为主,次为灯影组灯三段及陡山沱组。其中,筇竹寺组烃源岩厚度为90m左右、Ro大于2%、有机碳丰度平均值为1.48%,生气强度约20×108m3/km2。因此,筇竹寺组页岩应为优质有效烃源岩。合川-广安地区灯影组地层受乐山-龙女寺古隆起演化明显,油气运聚具多期成藏特征。总体看来,研究区灯影组位于相对有利的沉积环境、构造演化有利于成藏、储-盖搭配较好利于油气聚集、气藏圈闭类型主要以构造-岩性复合圈闭为主,为相对有利的勘探区带。
[Abstract]:Great breakthrough has been made in the exploration of deep marine carbonate rocks in Sichuan Basin. The Sinian system exploration in the Gaoshita-Moxi area shows that the basic oil and gas geological conditions are good, the oil and gas resources are abundant, and the exploration potential is good. In view of such factors as deep burial, complex diagenesis, insufficient understanding of reservoir formation law and low exploration degree, the basic characteristics and main controlling factors of Dengying formation reservoir in Hechuan-Guangan area east of Gaomo are analyzed. Therefore, it is of great significance to deepen the study of reservoir characteristics of Dengying formation in Hechuan-Guangan area, to carry out its oil-gas bearing property and to expand the exploration scene. The carbonate rocks of the Dengying formation of the Sinian system in Hechuan-Guang 'an area are mainly composed of grey algal dolomite, grain dolomite, sand dolomite and dissolved collapse breccia. The sedimentary facies type is mainly carbonate tidal flat. It can be divided into two phases: shallow water platform flat and semi-deep water platform flat, and high energy beach, higher energy hill, algae dune, low energy cloud flat, low energy cloud mud flat and other sub-/ microfacies. The reservoir space types are intergranular dissolved pore, intergranular dissolved pore and fracture, etc. The porosity of the second stage of the study area and adjacent area is 2 ~ 3. 5 and the permeability is 0. 01 ~ 0. 1 mD.The porosity of the fourth section of the lamp is mainly distributed between 4.0% and 9. 0%, the secondary porosity is 2. 5% and the permeability is 0. 1 ~ 10 mD. the total porosity is low. The reservoir is mainly distributed at the top of the second section of the lamp and the fourth section of the lamp. The upper part of the second section of the lamp is thicker and the lateral distribution is continuous, and the upper reservoir of the fourth section of the lamp is more continuous, and the thickness is gradually thinning from the west to the east. In the study area, the source rocks are mainly covered with dark mud shale of Qiongzhusi formation, followed by Dengying formation and Doushantuo formation. The thickness of source rock of Qiongzhusi formation is about 90 m and Ro is more than 2. The average value of organic carbon abundance is 1.48 and the gas generation intensity is about 20 脳 108 m3 / km2. The Qiongzhusi formation shale should be a high quality effective source rock. The strata of Dengying formation in Hechuan and Guangan area are obviously evolved by Leshan-Longnusi paleouplift, and the hydrocarbon migration and accumulation are characterized by multi-stage accumulation. Generally speaking, the Dengying formation in the study area is located in a relatively favorable sedimentary environment, and the tectonic evolution is favorable to reservoir formation. The combination of reservoir and cap is favorable for oil and gas accumulation, and the trap type of gas reservoir is mainly tectonic-lithologic complex trap, which is a relatively favorable exploration zone.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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