EVOLUTION OF SOUTHWEST BOZHONG SUB-DEPRESSION AND ITS BEARING ON HYDROCARBON GENERATION
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摘要:
渤中西南洼及其环带不同构造位置油气富集程度差异较大，且已发现的油藏油源存在巨大差异。为了明确渤中西南洼成藏规律及勘探方向，从构造特征出发，精细分析各个洼槽的结构特征，进而分析洼槽演化与烃源岩演化的关系，总结陆相断陷洼槽综合评价方法。研究表明，渤中西南洼4个洼槽特征迥异，可分为断槽继承型、断槽早衰型、断超早衰型和断超继承型。不同类型洼槽具有其特殊的烃源岩发育及演化历史：断槽继承型洼槽发育3套烃源岩，且均成熟；而断槽早衰型洼槽仅沙三段具有供烃能力，即洼槽的类型控制了生烃灶的发育。同时，不同类型洼槽具有其特征构造形态和成藏体系，控制了各洼槽不同生烃层系的油气优势运移方向，进而导致不同构造位置油气富集程度和有利勘探方向的差异。
Abstract:The exploration of oil and gas in Southwest Bozhong Sub-depression shows that the enrichment degree of hydrocarbon is different in different reservoirs, since the difference in oil sources. In order to find out the control factors of hydrocarbon accumulation and effective exploration targets, we studied the relationship between troughs and source rocks based on a thorough study of the structural features of different kinds of troughs, and a comprehensive evaluation method is summarized and presented. Up to date, four types of troughs are recognized in the region, namely the inherited fault trough, the early decline fault trough, early decline fault and overlapping trough, and inherited fault and overlapping trough. The differences of trough evolution also control the evolution of source rock, and determined the main source rock formation and the advantages of migration direction, finally lead to great disparities of hydrocarbon source in different structures. According to the study, we succeedly optimized the exploration targets in the Southwest Bozhong Sub-depression.
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