PETROLEUM ACCUMULATION PATTERN OF DONGYING FORMATION IN JZ-X OIL FIELD AND ITS SIGNIFICANCE TO ROLLING DEVELOPMENT
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摘要: 通过锦州X油田的油源、储盖组合、油气疏导体系和运移方式的详细分析,结合油田的油气分布、流体性质变化、油藏压力变化及边界断层活动规律的研究,建立了锦州X油田上渐新统东营组油气藏的成藏模式。研究结果表明,锦州X油田的油气运移为单向、双源、侧向独立运移,不同时期气、油沿断层垂向聚集,属差异置换的成藏模式。在这种成藏模式的指导下,发现了主力油藏下部的新气藏,新增了油田的石油地质储量。气藏的发现满足了油田的发电需求,也为周边其他气田提供了气源。同时,新增的石油地质储量也提高了锦州X油田的开发效益。Abstract: Oil and gas accumulation pattern is of significance for rolling development of an oil field. Through the detailed study of the source, reservoir and cap combination, oil and gas drainage system and migration pattern, we established the oil/gas reservoir pattern for the Dong Ying formation of the JZ-X oilfield. Research results about oil and gas distribution, fluid property variation, reservoir pressure changes and boundary fault activities were presented in the paper. Our results suggest that the migration of oil and gas in the oilfield be caused by differentiation of oil and gas, when hydrocarbon accumulated vertically along the fault in different periods. The migration was characterized by single direction, double oil sources and independent lateral migration along faults. Some new gas reservoirs which are located under the major oil reservoir were discovered and the hydrocarbon reserves in place increased under the guidance of the oil-gas migration pattern. The discovery of gas reservoirs has satisfied the needs of power plants of the field,in addition to the needs as gas source for the surrounding gas fields. The new oil reserves are rather profitable to the oil field.
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