川东涪陵地区下侏罗统大安寨段沉积相研究

发布时间：2018-03-28 06:24

本文选题：川东涪陵地区　切入点：大安寨段　出处：《成都理工大学》2015年硕士论文

【摘要】：川东地区是四川盆地内有利的油气储备区块,其中下侏罗统自流井组大安寨段为主要的含油气层位,油气资源丰富,具有良好的油气勘探前景。开展本项目的研究具有明显的经济效益和显著的社会效益。以川东地区下侏罗统大安寨段为研究对象,在野外剖面测量、钻井岩心描述和薄片鉴定的基础上,结合测井资料、地震资料和区域构造-沉积背景的综合研究,以岩石微观结构观察为研究手段,以大地构造学理论、沉积盆地分析理论及沉积学理论为指导,并结合前人的研究成果,重点剖析大安寨段沉积相特征及其平面展布规律,并对有利区进行有效预测。据“点—线—面”的研究思路,开展从单井分析到连井对比,从岩石学特征、沉积相标志及地震反射响应特征等方着手研究,最终编制出沉积相平面展布图,为今后研究区的勘探开发提供技术支持。通过对大安寨段沉积特征研究,取得如下重要进展和认识:①通过相标志的识别以及对反映沉积相垂向变化的单井相分析,确定了川东涪陵地区大安寨段主要是以碳酸盐岩为主的湖相混合沉积体系,可识别出半深湖—深湖、湖坡、碳酸盐浅湖、陆源碎屑浅湖和滨湖5个亚相及9个微相类型,并建立了适合该地区的沉积相模式;②依据层序地层学原理,川东涪陵地区大安寨段可划分出1个长期、5个中期以及众多相当准层序级别的短期基准面旋回层序,经历了从滨、浅湖—半深湖-深湖—滨、浅湖的完整湖侵-湖退沉积演化过程;③在建立的层序格架基础上,结合单井沉积相分析、沉积相连井对比分析及颗粒灰岩厚度图、地层厚度图、地震相等图件,编制了大安寨段层序-岩相古地理图,系统分析了沉积相的分布特征及时空演化规律;④在上述研究成果之上,结合前人资料,预测了大安寨段有利的非常规储集体发育和页岩气(油)聚集成藏的“甜心”位置。
[Abstract]:East Sichuan is a favorable oil and gas reserve block in Sichuan basin, in which the Da-anzhai formation of the Lower Jurassic Ziliujing formation is the main oil-bearing gas reservoir, and the oil and gas resources are abundant. It has a good prospect of oil and gas exploration. The research of this project has obvious economic and social benefits. Taking the Da-anzhai section of Lower Jurassic in East Sichuan as the research object, the field profile survey is carried out. On the basis of core description and thin section identification, combined with logging data, seismic data and regional tectonic-sedimentary background, the microstructural observation of rock is taken as the research means and geotectonic theory is used. Under the guidance of sedimentary basin analysis theory and sedimentology theory, combined with previous research results, the characteristics of sedimentary facies and its plane distribution in Da'anzhai member are analyzed emphatically, and the favorable areas are effectively predicted. According to the research ideas of "point-line-plane", From single well analysis to continuous well correlation, from petrological characteristics, sedimentary facies markers and seismic reflection response characteristics, etc., the plane distribution map of sedimentary facies was compiled. This paper provides technical support for the exploration and development of the future study area. By studying the sedimentary characteristics of Da'anzhai member, we have made the following important progress and understanding: 1 through the identification of facies markers and the analysis of single well facies reflecting the vertical variation of sedimentary facies, The lacustrine mixed sedimentary system of the Da'anzhai formation in the Fuling area of East Sichuan Province is mainly composed of carbonate rocks. Five subfacies and nine microfacies types of semi-deep lacustry-deep lake, lake slope, carbonate shallow lake, continental clastic shallow lake and littoral lake are identified. According to the principle of sequence stratigraphy, the depositional facies model is established. According to the principle of sequence stratigraphy, the Da'anzhai formation in Fuling area of East Sichuan can be divided into 1 short term datum cycle sequence of long term, 5 middle period and many quite quasi-sequence levels, which has experienced from shore to coast. On the basis of the established sequence framework, the correlation analysis of sedimentary facies of single well, the correlation analysis of sedimentary contiguous well, the thickness map of granular limestone, the thickness map of stratum, the evolution process of shallow lake, semi-deep lake, deep lake and shore, shallow lake, transgression and retrogression of shallow lake. The sequence lithofacies paleogeography map of the Da'anzhai member is compiled, and the distribution characteristics and space-time evolution law of sedimentary facies are analyzed systematically on the basis of the above research results, combined with previous data. The favorable unconventional reservoir development and the "honey" position of shale gas accumulation in Da'anzhai formation are predicted.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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