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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (9): 1225-1238.doi: 10.11764/j.issn.1672-1926.2020.04.007

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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

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   

  1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China
  • Received:2020-03-23 Revised:2020-04-06 Online:2020-09-10 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)

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Abstract:

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.

Key words: Anyue Gas Field, Sinian, Platform margin belt, Inner platform area, Mound facies, Supergene karstification

CLC Number: 

  • TE122.1

Fig.1

Geological conditions of study area and seratigraphic characteristics"

Fig.2

Basic information of reservoir characteristics in platform margin and inner platform area"

Fig.3

Histogram of macro fracture density distribution and core identification picture of Dengsi coring well section in platform margin and inner platform area"

Fig.4

Hole development ratio and hole density distribution histogram of core reservoir in platform margin and inner platform area"

Fig.5

Distribution histogram of pore throat diameter in platform margin and inner platform area"

Fig.6

Porosity distribution histogram of core reservoir in platform margin and inner platform area"

Fig.7

Reservoir contrast map of Well Gaoshi 7- Well Gaoshi 8-Well Gaoshi 125-Well Gaoshi 20-Well Gaoshi 124-Well Gaoshi 21 in platform margin and inner platform area"

Fig.8

Different combination types of reservoirs in the area of platform margin and inner platform area"

Fig.9

The contrast section of crossing wells section depicting Z2dn4 in platform margin and inner platform area"

Fig.10

Karst paleogeomorphology map of the end of Tongwan in Anyue Gas Field"

Fig.11

Reservoir contrast map of different paleogeomorphic areas"

Fig.12

A schematic diagram of the relationship between karst geomorphology and reservoir development in the Gaoshiti- Moxi area"

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