0 引言
1 区域地质背景
2 台缘和台内区储层发育特征对比
2.1 共性特征
图2 台缘—台内区储层特征基本情况Fig.2 Basic information of reservoir characteristics in platform margin and inner platform area |
Analysis of reservoir difference and controlling factors between the platform margin and the inner area of the fourth member of Sinian Dengying Formation in Anyue Gas Field, central Sichuan
Received date: 2020-03-23
Revised date: 2020-04-06
Online published: 2020-09-04
Supported by
The National Key R & D Program of China(2017YFC0603106)
The China National Science & Technology Major Project of the 13th Five⁃year plan(2016ZX05004⁃005)
The China National Science & Technology Major Project(2017ZX05008⁃005⁃003)
The Project of Technology Department, PetroChina Southwest Oil & Gas Field Company(20190301⁃10)
The reservoir of Dengying Formation of Sinian system is controlled by the combination of Tongwan II episodic karstification and dune beach facies in Anyue gas field, central Sichuan. Its lithology is complex and the reservoir is highly heterogeneous in vertical and horizontal directions, which results in great differences between the reservoir at the platform margin and in the platform, and the difference of single well productivity (the former is obviously better than the latter). In order to overcome the major problems and challenges in the process of fine evaluation and exploration, such as high-efficiency development of the platform edge zone, upgrading of reserves scale in the platform area, fine prediction of high-quality reservoir earthquakes, etc., this paper analyzes the reservoir commonness and differences of the four members of the Sinian Dengying Formation in Anyue gas field, central Sichuan Province, based on the observation of drilled cores and thin sections, combined with the analysis of laboratory, seismic and logging data and discuss the controlling factors. The results show that the reservoir space and reservoir types are basically the same in the platform margin area and in the platform area, but the development degree and physical properties of the reservoir dissolution holes in the platform margin area and in the platform area are weakening, the reservoir development degree, quality and development location are different, and the reservoir combination types are different. The main factors that cause the reservoir differences are the development degree of favorable mound beach facies and Tongtan facies according to the study of reservoir development characteristics and distribution law and the analysis of seismic reflection mode of high-yield wells, the high-quality reservoir development blocks are selected for exploration, and good application results are obtained. The high-efficiency development of the platform edge zone of Anyue Gas Field is realized, and the drilling rate and single well production of high-quality reservoir in the platform area are improved. The scale of reserves has been upgraded.
Xing-wang TIAN , Han-lin PENG , Yun-long WANG , Dai-lin YANG , Yi-ting SUN , Xi-hua ZHANG , Long WEN , Bing LUO , Hai-tao HONG , Wen-zhi WANG , Kui MA , Mao YE , Jiu-huo XUE . Analysis of reservoir difference and controlling factors between the platform margin and the inner area of the fourth member of Sinian Dengying Formation in Anyue Gas Field, central Sichuan[J]. Natural Gas Geoscience, 2020 , 31(9) : 1225 -1238 . DOI: 10.11764/j.issn.1672-1926.2020.04.007
图2 台缘—台内区储层特征基本情况Fig.2 Basic information of reservoir characteristics in platform margin and inner platform area |
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