新沟地区新下Ⅱ油组法气富集规律及有利区预测

发布时间：2018-07-17 02:49

【摘要】：新沟油田位于江汉盆地潜江凹陷南部地区,靠近总口向斜南部的继承性古斜坡上的新沟断垒带内,新沟咀组下段为江汉盆地的主要含油气层之一,凹陷南部具有较大勘探潜力,但针对其区域基础地质研究、岩性岩相展布规律、储层特征及分布规律、有利储层空间预测、油气成藏主控因素及富集规律等方面的认识还不够系统和深入,特别是对南部地区的致密油富集规律的认识还不足,严重影响和制约了南部地区的勘探步伐。本论文主要是以石油地质学,油藏描述、储层地质学的理论方法为指导,以新沟咀组新下Ⅱ油组为研究对象,以岩心资料、测井资料、录井资料、分析化验资料、地震解释、生产测试资料为依据,综合利用各种研究方法以及结合前人的研究成果对新沟地区新下Ⅱ油组开展沉积相研究、储层特征及控制因素研究、烃源岩分布特征及油源对比研究。根据这些研究结论系统分析研究区油藏类型及特征、新下Ⅱ油组油气有利富集相带、油气储层的展布,从而预测有利储层及油气富集规律,为油田下一步勘探部署提供理论依据。通过系统研究主要取得了以下几点认识：1.新下Ⅱ油组以浅湖泥质白云岩坳陷期沉积特征为主,是致密油藏形成的有利层段。研究区碳酸盐岩的沉积是受古地貌控制,岩性特征主要表现为厚层泥岩夹薄层泥晶白云岩和中层灰黄色泥晶白云岩与薄层深灰色泥岩呈不等厚互层或中层白云岩与中层泥岩等厚互层。本区不等厚互层是这种地势相对较高区域的岩性所表现出来主要特征；而沉积厚度介于前两者之间的过渡区域,即古地形上的高部位与低洼之间的过渡区域,白云岩含量较高,主要表现为厚层灰黄色泥晶白云岩夹薄层深灰色泥岩。2.根据新沟地区4口全井段取芯井的岩心、薄片仔细观察以及全区200多口探井的钻井资料分析,确定了研究区沉积相的类型为浅湖沉积相类型,其中亚相为湖坪、浅湖砂坝和局限洼地,湖坪分为泥坪和云坪两个微相,局限洼地划分为泥质洼地和云质洼地两种微相类型。3.研究区主要是白云岩储层,主要的岩石类型包括：泥晶白云岩、泥页岩、白云质泥岩、泥质白云岩、泥膏岩、膏质泥岩、粉砂岩共七种岩性。储层的孔隙类型主要有原生孔隙、次生孔隙、裂缝。孔隙类型以晶间孔隙发育为主。通过对普通薄片,阴极发光片及扫描电镜鉴定发现,研究区新下Ⅱ油组碳酸盐岩储层为中孔-特低渗储。4.储层控制因素的综合分析认为,沉积环境和沉积相是碳酸盐岩储层发育的主要控制因素,成岩作用对储层既有破坏作用又有促进作用、胶结作用和溶蚀作用类型。压实作用和白云石化作用降低储层的孔隙度和渗透率。溶蚀作用对储层孔隙有改善作用,提高储集物性。5.研究区烃源岩有机质丰度整体较高,有机质类型以Ⅱ2型为主,烃源岩热演化程度整体较低,新下Ⅱ油组主体处于低成熟热演化阶段。油源对比分析表明新沟地区新下Ⅱ油组原油为低熟原油,来源于本层段中下部低成熟的烃源岩,而与老新油田和拖市油田原油有较大差别。研究区NE部靠近总口向斜方向,烃源岩成熟度相对较高,所生成的油气可以通过断层和高渗透层组成的输导体系运聚到构造高部位成藏。6.通过典型油藏解剖认为在研究区EN部构造相对低部位,油气主要是源储直接对接或邻近的非常规油气成藏模式。在研究区中部构造高点地区,属于常规的二次运移成藏模式。而在研究区南部地区成藏概率较小。
[Abstract]:The Xin Gou oil field is located in the southern part of the Qianjiang sag of the Jianghan Basin, near the new furrow fault zone on the inherited paleo slope of the southern part of the general estuary. The lower section of the Xin Gou Tsui formation is one of the main oil and gas bearing strata in the Jianghan Basin, and the south of the sag has a great exploration potential, but the lithologic facies distribution law and reservoir characteristics for its regional basic geological study. The understanding of the distribution law, the favorable reservoir space prediction, the main controlling factors and the enrichment law of the oil and gas accumulation is not systematic and deep, especially the understanding of the dense oil enrichment law in the south area is still insufficient, which seriously affects and restricts the exploration step in the southern region. This paper mainly is petroleum geology, reservoir description and reservoir. Based on the theory and method of geology, taking the new oil group of Xin Gou Tsui group as the research object, based on core data, logging data, logging data, analysis and laboratory data, seismic interpretation, and production test data, the study on the sedimentary facies of the new second oil group in the Xin gou area is carried out synthetically by using various research methods and combining the previous research results. Research on reservoir characteristics and control factors, distribution characteristics of hydrocarbon source rocks and oil source contrast research. According to these conclusions, the reservoir types and characteristics are systematically analyzed, and the favorable enrichment phase and distribution of oil and gas reservoirs in the new lower oil group are used to predict the favorable reservoir and oil and gas accumulation rules, providing theoretical basis for the next exploration and deployment of the oil field. According to the systematic study, the following understandings have been obtained: 1. the sedimentary characteristics of the new lower oil group are mainly in the shallow lake muddy dolomite depression period, which are favorable layers for the formation of dense reservoirs. The sedimentary carbonate rocks in the study area are controlled by the ancient geomorphology, and the lithologic characteristics are mainly characterized by the thick mudstone sandwiched with thin muddy dolomite and the middle layer of gray yellow. The interbedded interbeds between the mudstone dolomite and the thin layer of the deep gray mudstone are interbedded with the middle layer of dolomite and middle mudstone. The unequal thickness in this area is the main characteristic of the lithology of the relatively high terrain, and the sedimentary thickness is in the transitional region between the former two, that is, the transition between the high part of the palaeotopography and the low depression. Area, the content of dolomite is high, mainly characterized by thick layer of gray yellowish mudstone with thin layer of deep gray mudstone.2., according to the core of the core well in 4 full well section of the Xin Gou area, carefully observed and analyzed by the drilling data of more than 200 exploration wells in the whole area, the type of sedimentary facies in the study area is a shallow lake sedimentary facies type, of which the subfacies is the lake. Ping, shallow lake sand dams and limited depressions are divided into two microfacies of mud flat and Yunping. The limited low-lying land is divided into muddy and cloud lying two types of microfacies.3. research area mainly dolomite reservoir. The main rock types include muddy dolomite, shale, dolomitic mudstone, muddy dolomite, mud paste rock, plaster mudstone, siltstone. There are seven types of lithology. The main pore types are primary pores, secondary pores and cracks. The main pore types are intergranular pore development. Through the identification of common thin slices, cathodoluminescence films and scanning electron microscopy, the carbonate reservoir of the new lower oil group in the study area is a comprehensive analysis of the control factors of the mesoporous and ultra-low permeability reservoir.4. reservoir. The facies and sedimentary facies are the main controlling factors for the development of carbonate reservoirs. The diagenesis has both destructive and promoting effects on the reservoir, cementation and corrosion types. Compaction and dolomitization reduce the porosity and permeability of the reservoir. The dissolution effect improves the pore space of the reservoir and improves the reservoir physical.5. research area. The organic matter abundance of the source rocks is higher, the type of organic matter is mainly type II 2, the thermal evolution of the source rocks is low, the main body of the hydrocarbon source rocks is in the low mature thermal evolution stage. The oil source comparison analysis shows that the new lower oil group of the new lower oil group in the new Valley is low mature crude oil, which is derived from the low mature source rock in the middle and lower part of the section, and it is with the old new oil field. In the study area, the NE part of the study area is close to the general syncline, and the maturity of the source rocks is relatively high. The generated oil and gas can be transported through the transport system composed of faults and high osmosis layers to the high part of the reservoir to form a reservoir of.6., which is considered to be relatively low in the EN part of the study area and the oil and gas are the main source. In the middle of the study area, the high point area in the middle of the study area belongs to the conventional two migration model, but the probability of accumulation is small in the southern part of the study area.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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