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本文对低熟油气的源岩评价、成因机理、油气运移、成藏特征及油气勘探等几个方面进行简要剖析。源岩在低熟阶段仅能生成一部分烃类,因而对各个地区的低熟源岩评价标准应适当调整。低熟油的源岩主要形成于淡水湖相、沼泽相和半咸水-咸水湖相,可通过多种成因机理早期生烃。低熟油的排烃仍受源岩层与储层流体的压差驱动,因而排烃较为有利,且运移距离较短。低熟油藏常位于储层物性好、靠近油源区、继承性好的同沉积构造圈闭上。
This paper briefly analyzes the source rock evaluation, genesis mechanism, hydrocarbon migration, reservoir forming characteristics and hydrocarbon exploration in low-mature oil and gas. The source rock can only generate a part of hydrocarbons in the low-maturity stage. Therefore, the evaluation criteria for low-maturity rocks in all areas should be properly adjusted. Source rocks of low-mature oil are mainly formed in freshwater lacustrine facies, swamp facies and brackish-lacustrine lacustrine facies, and hydrocarbon generation can occur early through a variety of genetic mechanisms. Hydrocarbon expulsion of low-mature oil is still driven by the pressure difference between the source rock and reservoir fluid, so hydrocarbon expulsion is more favorable and the migration distance is shorter. Low-maturity reservoirs are often located in the reservoir properties of good, close to the oil source area, the succession of the same sedimentary trap.