吴起油田曾岔油区三叠系油藏精细描述

发布时间：2019-01-23 10:09

【摘要】：本文以沉积岩石学、构造地质学、石油地质学为指导,利用岩心分析、测井、试油等资料,研究了吴起油田曾岔油区三叠系小层对比及砂体的分布、构造特征、沉积微相、储层物性、油藏特征等。分析认为：在三叠系,研究区河道主体呈北东-南西向展布,砂体非常发育,砂岩厚度大,横向延伸较远,这为油气的聚集提供了良好的储集空间。延10油层组主要为辨状河相河道砂体沉积,总体上具有矿物成熟度低、结构成熟度中等-高的特点。长4+5、长6、长9油层组主要为三角洲前缘水下分流河道砂体沉积。储集层主要以细砂岩、粉砂岩为主,极少量中砂岩及粗砂岩,总体表现为低成分成熟度、高结构成熟度的特点。延10-长9油组砂岩储层孔隙类型主要为粒间孔,占总孔隙类型的3.9%；其次为粒内孔、铸模孔、长石溶孔。各类孔隙所占的总面孔率平均值为6.4%。研究区延10、长4+5、长6、长9油层组储层主要为小孔微细喉型储层。主要为一套低孔-低渗到特低孔-特低渗储层。储层影响因素分析认为,沉积作用和成岩作用是影响本区储层的主要因素。延10、长4+5、长6、长9油藏属岩性油藏,油藏驱动类型以弹性驱动和溶解气驱动为主。按照《石油天然气储量计算规范》要求,研究区延10、长4+5、长6、长9段储层共估算石油探明地质储量7526.26x104t。
[Abstract]:Based on the data of sedimentary petrology, structural geology and petroleum geology, the paper studies the comparison of the triassic strata and the distribution, the structural characteristics, the sedimentary microfacies, the reservoir physical properties, the reservoir characteristics and so on in Wuqi Oilfield. In the Triassic system, the main body of the study area is distributed in the north-south-west direction, the sand body is very developed, the thickness of the sandstone is large, the lateral extension is far, which provides a good reservoir space for the accumulation of oil and gas. The Y10 reservoir group is mainly the sediment of the river-channel sand body of the differentiation-like river, and has the characteristics of low mineral maturity and medium-high structural maturity. The long 4 + 5, 6, and 9 reservoir groups are mainly delta front subaqueous distributary channel sand body deposition. The reservoir is mainly composed of fine sandstone and siltstone, with a small amount of sandstone and coarse sandstone, which is characterized by low component maturity and high structural maturity. The pore type of the sandstone reservoir in the 10-long 9-oil group is mainly intergranular pore, accounting for 3.9% of the total pore type, followed by an inner hole, a mold hole and a feldspar dissolving hole. The average face rate of all kinds of pores is 60.4%. The study area is 10, the length is 4 + 5, the length is 6, and the reservoir of the long 9 oil layer is mainly small-hole micro-throat type reservoir. It is mainly a set of low-porosity and low-permeability low-permeability low-permeability reservoir. The analysis of the influence factors of the reservoir is that the sedimentation and diagenesis are the main factors that affect the reservoir in this area. There are 10, 4 + 5, 6 and 9 reservoirs, which belong to the lithological reservoir, and the oil reservoir driving type is mainly driven by elastic driving and dissolved gas. The proven geological reserve of oil is estimated to be 7526. 26x104t in a total of 10, 4 + 5, 6, and 9 reservoirs in the study area according to the requirements of the Petroleum and Natural Gas Reserves Calculation Specification.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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