PETROLEUM GEOLOGY IN THE AREA OFFSHORE LIAOHE AND MAIN FACTORS IN HYDROCARBON ACCUMULATION
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摘要: 辽河滩海地区为辽河油田重要的油气产量接替区,搞清其成藏特点与成藏主控因素对指导该区油气勘探意义重大。总体上,油气富集带围绕生烃洼陷呈环带状分布且已发现油气藏多分布于主干断裂附近。但不同地区油气分布存在差异性:西部和中部聚油,东部油气并存;西部缓坡带主要为反向正断层控制下的断块油气藏,中部和东部陡坡带为主干断裂控制下的断鼻型和构造-岩性油气藏。通过典型油气藏解剖和油气成藏条件分析,认为有效烃源岩、输导体系和区域盖层分布是辽河滩海地区油气成藏的主控因素:有效烃源岩热演化程度控制了油气分布;输导体系决定了油气运聚成藏方式;区域盖层分布控制了油气纵向聚集层位。Abstract: The area offshore Liaohe is the strategic hydrocarbon resources replacement area of Liaohe oilfield. A correct understanding of the characteristics and main controlling factors in hydrocarbon accumulation is of great significance to petroleum exploration in this area. Most of the discovered oil and gas reservoirs are around the hydrocarbon-generation depression, and close to the main faults. However, there are big differences in hydrocarbon accumulation between different regions. The western and middle areas are enriched in oil, while the eastern part is enriched in both oil and gas. The main reservoir types in the western part which is a gentle slope are fault-block reservoirs controlled by antithetic normal faults, whereas those in the middle and eastern regions, which are the steep slope belts, are fault-nose and structural-lithological reservoirs. Combined with the conditions of hydrocarbon accumulation, it was summarized that the main controlling factors in hydrocarbon migration and accumulation are active source rock, conduit system and regional cap rocks. The maturity of active source rocks determines the oil and gas distribution; the conduit system determines the modes of hydrocarbon migration and accumulation; the regional cap rock determines the vertical horizons rich in oil and gas.
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