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Structure of Ordovician Carbonate Unconformity Zone in Tazhong Area(PDF)

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

Issue:
2006年第02期
Page:
41-44
Research Field:
Publishing date:

Info

Title:
Structure of Ordovician Carbonate Unconformity Zone in Tazhong Area
Author(s):
LIU Ke-qi1CA I Zhong-xian2ZHANG Shu-zhen1ZHAO Gui-qing1
1. Dongxin Petroleum Production Plant, Shengli Oil field Company of SINOPEC, Dongying 257094, Shandong, China; 2. School of Resources, China University of Geosciences, Wuhan 430074, Hubei, China
Keywords:
Tazhong area Ordovician carbonate unconformity zone structure Tarim Basin Xinjiang
PACS:
P618.130.2;TE121.3
DOI:
-
Abstract:
The unconformity between the middle-upper and the lowerOrdovician serials is well developed in Tazhong are- a. As the favorable place of dissolution, the unconformity zone has the function to serve as the pathway of the migration and accumulation of oil and gas because of the improvement of its physical property. The unconformity zone is of great significance in the petroleum prospecting. The structure of the Ordovician carbonate unconformity zone is studied by means of geological and geophysical method. There are two different fields of fluid flow above and under the Ordovician carbonate unconformity in terms of the characteristics of fluid flow in Tazhong area. The migration pathway under the unconformity is mainly composed of pores, caves, and fractures where the flow regularities are complicated. While the migration pathway above the unconformity mainly consists of pores where the fluid flow can be characterized by Darcy’s law. Apparently, there will be a shift of the flow pattern when the fluid migrates upward to penetrate through the un- conformity, and it is of great importance for the petroleum accumulation.

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Last Update: 2006-06-20