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Pore Types of Sandstone Reservoir and Evaluation of Favorable Reservoir of Taizhou Formation in Eastern Subei Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第03期
Page:
246-252
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Pore Types of Sandstone Reservoir and Evaluation of Favorable Reservoir of Taizhou Formation in Eastern Subei Basin
Author(s):
ZHU Xiao-min1; LI Ya-hui2; ZHANG Yi-na1; WANG Wen-jun2; ZHANG Ya-xiong1; YANG Li-gan2; WANG Xin1
1. School of Geosciences, China University of Petroleum, Beijing 102249, China; 2. Geological ResearchInstitute, Jiangsu Oilfield Company, China Petroleum and Chemical Corporation, Yangzhou 225200, Jiangsu, China
Keywords:
sandstone reservoir;  secondary pore;  Taizhou Formation;  Haian Depression;  Gaoyou Depression;  Subei Basin
PACS:
TE122.2+21;P618.130.2+1
DOI:
-
Abstract:
The pore types of sandstone reservoir and evaluation of favorable reservoir of Taizhou Formation of Haian and Gaoyou Depressions, which are the key regions in Subei Basin, were studied according to the reservoir analytical data from more than 50 wells. The results showed that the sandbodies of delta, turbidite fan and fan-delta, which were composed of feldspatite debris sandstone and rock debris arkose with low maturity of content and texture, were developed, and there were many secondary pores and little primary pores in sanstone reservoir of Taizhou Formation of Haian and Gaoyou Depressions; the first secondary pore zone located in the depth of 2 300-2 500 m in Taizhou Formation of Haian Depression, because many carbonate cement, feldspar and debris dissolved obviously, the porosities of sandstones were 12%-25%, and the second secondary pore zone located in the depth of 2 600-3 200 m; it was different of pore evolution of reservoir in Taizhou Formation between Haian and Gaoyou Depressions, because there was only one secondary pore zone(2 400-2 900 m)in Gaoyou Depression and the porosity of sandstone was similar to that in Haian Depression; the formation of secondary pore of sandstone reservoir in Taizhou Formation was controlled by organic acid, phenol and carbonic acid during the organic evolution; most secondary pores were produced by the dissolution of intergranular carbonate cements; the favorable reservoir in Haian Depression distributed in northwestern and eastern delta front sandstone and turbidite fan sandstone, and the favorable reservoir in Gaoyou Depression distributed in southern fan-delta front sandstone; physical properties of all the favorable reservoirs were good, and the depths of burial were shallow, so the reservoirs were favorable areas for the further exploration.

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Last Update: 2011-09-20