欢喜岭油田欢95井区沙四段精细地层对比及沉积相研究

发布时间：2018-10-08 14:46

【摘要】：本论文针对欢喜岭油田开发程度较低的欢95井区的低孔特低渗沙四段储层,进行精细地层对比及沉积相研究,总结沙四段内部细分层段沉积与砂体分布规律；同时明确了特殊岩性段暗色泥岩分布规模,并对欢95井区沙四段油气资源的分布和潜力进行评价,为下一步有效开发该区块提供借鉴和指导。为了解决地层对比及沉积相问题,论文以层序地层学等理论为基础,采用地球物理的一些新技术,如测井标准化技术、沉积相分析技术、地质与地球物理相结合的综合地质研究技术,对欢95井区的沙四段储层进行了研究。认为沙四段主要为扇三角洲沉积,从下至上湖平面逐渐上升,发育水下分流河道、分流河道间、河口坝、溢岸砂、分流间、席状砂、浊积砂等7种沉积微相；物源主要来自西北方向,呈北北西向展布。对于沙四段内部的杜家台油层组河道规模由下到上呈有规律性的变化,杜Ⅰ油层组河道发育较宽,规模较大,杜Ⅱ油层组河道变窄,规模缩小。通过对特殊岩性段R0、TOC和有效烃源岩厚度3个参数分析,R0值一般位于0.4-0.7%之间,TOC值大部分达到3%以上,研究区烃源岩有机质丰度较好。综合沉积、构造、有机质丰度、暗色泥岩有效厚度等多因素综合分析,识别有利圈闭14个。
[Abstract]:In this paper, the fine stratigraphic correlation and sedimentary facies study are carried out for the reservoir of low porosity and low permeability sand in Huan95 well area, which has low level of development in Huanxiling Oilfield, and the sedimentary and sand body distribution law of subdivision formation in Shahejie formation is summarized. At the same time, the distribution scale of dark mudstone in special lithologic member is defined, and the distribution and potential of oil and gas resources of Sha4 formation in Huan95 well area are evaluated, which provides reference and guidance for the further effective development of this block. In order to solve the problem of stratigraphic correlation and sedimentary facies, based on sequence stratigraphy and other theories, some new geophysical techniques, such as logging standardization technology, sedimentary facies analysis technology, are adopted in this paper. The reservoir of the 4th member of Shahejie formation in Huan95 well area is studied by combining geological and geophysical techniques. It is considered that the fourth member of the formation is mainly fan delta deposit, which rises gradually from the bottom of the lake and develops 7 sedimentary microfacies, such as underwater distributary channel, estuarine dam, overflow sand, distributary, sheet sand, turbidite sand, etc. The provenance mainly comes from the northwest direction, and is distributed in the north-west direction. The river channel scale of the Dujiatai formation in the fourth member of the Shahejie formation changes regularly from bottom to top. The river channel of the Duyi formation is wider and larger, and the Dujiatai formation becomes narrower and smaller. Based on the analysis of the three parameters of R0 TOC and effective source rock thickness of the special lithologic member, the R0 value is generally between 0.4-0.7% and the TOC value is mostly above 3%. The organic matter abundance of the source rock in the study area is good. Comprehensive analysis of multiple factors, such as deposition, structure, abundance of organic matter and effective thickness of dark mudstone, shows that 14 favorable traps can be identified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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