AN ANALYSIS OF THE MAIN CONTROLLING FACTORS OF THE RESERVOIR FOR-MATION OF UPPER TRIASSIC YANCHANG FORMATION IN ORDOS BASIN

西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (2): 79-83.

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AN ANALYSIS OF THE MAIN CONTROLLING FACTORS OF THE RESERVOIR FOR-MATION OF UPPER TRIASSIC YANCHANG FORMATION IN ORDOS BASIN

LI Song ¹ HU Zong-quan ¹ YIN Wei ¹ LIU Zhen ² PAN Gao-feng ²

1. Research Institute of Petroleum Exploration& Production，SINOPEC, Haidian, Beijing 100083, China; 2. Key Laboratory for Hydrocarbon Accumulation of Education Ministry, China University of Petroleum, Changping, BeiJing 102249, China）Journal of SouthwestPetroleum University, Vol. 33, No. 2, 79 – 83, 2011（1674 – 5086，in Chinese

Received:1900-01-01 Revised:1900-01-01 Online:2011-04-20 Published:2011-04-20

Abstract

Abstract:

It is concluded that there are favorable conditions for oil accumulation in Zhenjing Area through the detailed analysis of many aspects of the Upper Triassic Yanchang Formation in Ordos Basin, such as hydrocarbon source conditions, reservoir conditions, reservoir-cap rock combination and the type trap. The research results of the controlling factors of oil reservoirs and the enrichment regularity indicate that the tectonic evolution controls
oil reservoir adjusting direction, old oil reservoir migrates to the north-east direction. Organic matter abundance distribution of hydrocarbon source rocks controls the oil accumulation. The area where the organic matter abun-
dance is more than 1 percent has favorable conditions for oil accumulation. The favorable deposit belts control the enrichment of oil and the underwater distributary channel of deltaicfront subfacies are close to hydrocarbon sources,
and have better sand body physical properties and a large thickness, making it a favorable site for the accumulation of petroleum. The dynamic reduction of fluid controls the migration direction of petroleum in reservoring time.
The bigger the dynamic reduction of fluid is, the more petroleum will be accumulated. The fracture serves as the migration channels for the hydrocarbon enrichment, and the porosity increasing caused by the fracture will further affect the hydrocarbon enrichment.

Key words: Ordos Basin, Yanchang Formation, reservoir formation, oil accumulation conditions, controlling factor, hydrocarbon accumulation

CLC Number:

TE122.3

LI Song HU Zong-quan YIN Wei LIU Zhen PAN Gao-feng . AN ANALYSIS OF THE MAIN CONTROLLING FACTORS OF THE RESERVOIR FOR-MATION OF UPPER TRIASSIC YANCHANG FORMATION IN ORDOS BASIN[J]. 西南石油大学学报(自然科学版), 2011, 33(2): 79-83.

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AN ANALYSIS OF THE MAIN CONTROLLING FACTORS OF THE RESERVOIR FOR-MATION OF UPPER TRIASSIC YANCHANG FORMATION IN ORDOS BASIN

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