油气是地壳中性质相对特殊的物质.长期以来人们用生、储、盖组合作为油气成藏评价的准则,但在生烃层存在的前提下,如何更为有效地评价储、盖条件或成藏圈闭条件呢?根据油气资源的特性,只有在非均一的地层和过渡性或准稳定的构造条件下才有利于形成油气成藏圈闭.而过渡性的沉积或构造环境以及在多旋回构造形成的叠合盆地中,特别是在叠合盆地中由于多次构造运动所形成的不整合界面上下,更容易形成非均一的成藏圈闭.在成藏评价中,三者的关系是相互依存和影响的.其中,由油气资源特性所决定的成藏圈闭的非均一性特点是主导条件,而过渡性的沉积或构造环境以及在多旋回构造形成的叠合盆地中,特别是在叠合盆地中由于多次构造运动所形成的不整合界面上下,更容易形成非均一的成藏圈闭,是由主导性所决定的必要条件.%The oil and gas resources are the materials that have relative special properties in the crust. For a long time, the source-reservoir-cap assemblage has been used as the criterion of the oil and gas accumulation evaluation. However, under the premise that the hydrocarbon-generating layer exists, how to evaluate reservoir and cap conditions or hydrocarbon accumulation trap conditions more effectively? According to the characteristics of the oil and gas resources, only in the nonuniform strata and under the transitional or quasi-steady tectonic conditions, can the reservoir-forming trap propitiously form. Nonuniform hydrocarbon accumulation traps can easier form in the transitional sedimentary or tectonic environment and in the superimposed basin formed by multicycle structure, especially above or below the unconformity interface formed by multiple tectonic movements in the superimposed basin. In the evaluation of the oil and gas accumulation, these three are dependent on and influential each other. Among them, the nonuniform characteristics of a hydrocarbon accumulation trap determined by the characteristics of oil and gas resources are the dominant conditions, and in the transitional sedimentary or tectonic environment and in the superimposed basin formed by multicycle structure, especially above or below the unconformity interface formed by multiple tectonic movements in the superimposed basin, a nonuniform hydrocarbon accumulation trap is easier to form. The latter two points are the necessary conditions determined by the leading character.
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