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Division of Gas Accumulation System and Laws Controlling Distribution of Natural Gas in Typical Petroliferous basins of China

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Journal of China University of Geosciences 2002年第4期13卷 306-312页

作者： jiang zhenxue pang {3. {4. zhijun chen dongxia basin & reservoir research Center, University of petroleum, beijing 10224. Key Laboratory of Hydrocarbon Accumulation, Ministry of Education, beijing 10224. basin & reservoir research Center University of Petroleum Beijing 102249 Key Laboratory of Hydrocarbon Accumulation Ministry of Education Beijing 102249

Considering the existing problems of the petroleum system, this paper bringsforward the concept of natural gas accumulation system and presents the dividing principles. Thendetailed statistics on the accumulation factors of the 3. typical natural gas accumulation systemsin China and studies on the laws controlling distribution of gas are collected. The research showsthat the petroleum accumulation system is the basic unit controlling petroleum generation, migrationand accumulation. Generating intensity, generating amount, accumulating efficiency and migrationdistance plays an important role in the distribution of natural gas. Through analysis on results ofresources evaluation, discovered reserves and residual reserves, potential areas in middle-scaledpetroliferous basins in China are forecasted in this paper. Ordos, Sichuan, Tarim and Qaidam basinsare found out to be the main basins developing and enriching gas accumulation systems.

关键词： petroliferous basins in china gas accumulation system petroleum system laws controlling gas potential area

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Division of Gas Accumulation System and Laws Controlling Distribution of Natural Gas in Typical Petroliferous basins of China

Division of Gas Accumulation System and Laws Controlling Dis...

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作者： jiang zhenxue pang {3. {4. zhijun chen dongxia (basin & reservoir research Center,University of petroleum,beijing {13. Key Laboratory of Hydrocarbon Accumulation,Ministry of Education,beijing {13.)

＜正＞1 BASIC CONCEPTS AND DIVISION PRINCIPLES ON petroleum ACCUMULATION SYSTEM 1.1 Basic Concept on petroleum Accumulation System The petroleum system （Magoon and Dow,1994.Magoon,1992,1990;Demaison and Huizinga,1991...

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Formation mechanism and model for sand lens reservoirs in the Jiyang Sub-basin,East China

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Science China Earth Sciences 2004年第Z2期47卷 167-176页

作者： LI Pilong 1, pang xiongqi2,3. chen {3.2,3. ZHANG Shanwen1, jin zhijun4.& jiang zhenxue2,3.1. Shengli Oil Field Ltd, SINOPEC, Dongying 257051, China 2. University of petroleum, beijing 10224., China 3. Key Laboratory of Oil and Gas Accumulation, Ministry of Education, beijing 10224., China 4. research Institute of petroleum Exploration and Exploitation, SINOPEC, {13. 100083. China Shengli Oil Field Ltd SINOPEC Dongying 257051 China University of petroleum Beijing 102249 China Key Laboratory of Oil and Gas Accumulation Ministry of Education Beijing 102249 China research Institute of petroleum Exploration and Exploitation SINOPEC Beijing 100083 China

The Bohai Bay basin comprises some very important and well documented subtle traps known in China, which have been the major exploration focus and have become a major petroleum play since the 1990s. However, recent exploration showed that the oil-bearing proper-ties of some sand lens reservoirs may vary significantly and the accumulation mechanisms for these lithological subtle traps are not well understood. Based on statistical analysis of oil-bearing properties for 123.sand lens reservoirs in the Jiyang Sub-basin and combined with detailed anatomy of typical sand lens reservoirs and NMR experiments, it has been shown that the structural and sedimentary factors, hydrocarbon generation and expulsion conditions of the sur-rounding source rocks, as well as the petrophysical properties of sand lens reservoirs are the main controlling factors for the formation of sand lens reservoirs. The formation of a sand lens reservoir depends on the interaction between the hydrocarbon accumulation driving force and the resistance force. The driving force is made up of the differential capillary pressure between sandstones and sources rocks and the hydrocarbon diffusion force, and as well as the hydro-carbon expansion force. The resistance force is the friction resistance force for hydrocarbons and water to move through the pore throats of the sand lens. The sedimentary environment, source rock condition and sand reservoir properties can change from unfavorable to favorable depend-ing on the combination of these factors. When these three factors all reach certain thresholds, the sand lens reservoirs may begin to be filled by hydrocarbons. When all of these conditions be-come favorable for the formation of sand lens reservoirs, the reservoir would have high oil satu-ration. This approach has been applied to evaluating the potential of petroleum accumulation in the sand lens reservoirs in the third member of the Neogene Shahejie Formation in the Jiyang Sub-basin.

关键词： sand lens reservoir, accumulation controlling factors, accumulation mechanism, accumulation model, Jiyang Sub-basin.

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