Controlling Factors on Petroleum Accumulation in Silurian Reservoir in Tazhong Uplift of Tar im Basin

HU Jian-feng; LU Xiu-xiang; ZHAO Feng-yun; CHEN Yuan-zhuang

The asphalt, movable oil and gas shows are quite abundant in the Silurian reservoir in the Tazhong up lift.Hydrocarbon accumulations of the Silurian are characterized bymultip le sources of oil and gas, multip le stages of reservoir formation, multiple types of pools, and multiple occurrences of oil and gas. Vertically, hydrocarbon distributions of the Silurian are controlled by the cap beds. The asphalt and heavy oil of the Silurian are distributed under the red mudstone of the lower member of Tataaiertage Formation, while the movable oils are distributed under the gray mudstone of the second upper sub-member of Kep ingtage Formation. Hydrocarbon accumulations of the Silurian are plainly controlled by structural background, paleo-up lift of inherited development determines the migration directions of hydrocarbon, and hydrocarbon of the Tazhong area basicallymigrated from northwest to southeast. The single sand-stone body formed in tide environment is thin and its scale is small. A series of sandstone bodywere communicated by faults. The Silurian hydrocarbon accumulation of Tazhong area is characterized by no highness in abundance of hydro-carbon accumulation, coincidence of thin layerswith large distributive area, and control of several types of traps.

1. China University of Petroleum, Beijing 102249;

2. Tarim Oilfield Company, PetroChina, Korle, Xinjiang 841000;

3. Key Laboratory for Petroleum Accumulation Mechanism of Petroleum University, Ministry of Education, Beijing 102249

Received Date: 2005-01-31

Rev Recd Date: 2005-05-10

Publish Date: 2005-12-10

Key words:

Tazhong Up lift /
Silurian /
characteristics of hydrocarbon accumulation /
controlling factors

Abstract: The asphalt, movable oil and gas shows are quite abundant in the Silurian reservoir in the Tazhong up lift.Hydrocarbon accumulations of the Silurian are characterized bymultip le sources of oil and gas, multip le stages of reservoir formation, multiple types of pools, and multiple occurrences of oil and gas. Vertically, hydrocarbon distributions of the Silurian are controlled by the cap beds. The asphalt and heavy oil of the Silurian are distributed under the red mudstone of the lower member of Tataaiertage Formation, while the movable oils are distributed under the gray mudstone of the second upper sub-member of Kep ingtage Formation. Hydrocarbon accumulations of the Silurian are plainly controlled by structural background, paleo-up lift of inherited development determines the migration directions of hydrocarbon, and hydrocarbon of the Tazhong area basicallymigrated from northwest to southeast. The single sand-stone body formed in tide environment is thin and its scale is small. A series of sandstone bodywere communicated by faults. The Silurian hydrocarbon accumulation of Tazhong area is characterized by no highness in abundance of hydro-carbon accumulation, coincidence of thin layerswith large distributive area, and control of several types of traps.

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Controlling Factors on Petroleum Accumulation in Silurian Reservoir in Tazhong Uplift of Tar im Basin

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