【摘要】 地下地温和地层压力是控制油气生成和演化以及赋存相态的两个最基本的物理参数。地温与地层压力之间相互影响。理论推导和实际资料均证实,地温与地层压力保持直线关系;在地下不同的温-压体系中,地温与地层压力的直线斜率不同;通常地下地层中存在两类地温-地压直线,即浅层地温-地压直线关系和深层地温-地压直线关系。浅层与深层地温-地压直线关系的改变表明浅层与深层两种地温-地压环境中流体能量不同,进而反映浅层与深层在宏观连通性上存在差别。更多还原

【Abstract】 Based upon the fundamental geologic models of sedimentary basins, this paper presents a new theoretical relation between subsurface temperatures and formation pressures by deriving the T-P state equation of adsorbed air bubbles in pore space of sediments. In one temperature-pressure system, the T-P relation maintains a linear equation. Linear equations of different subsurface temperature-pressure systems may be variant. Generally, in sedimentary basins there are two or more temperature-pressure linear relations, that is the shallow T-P linear equation and the deep relation (s). Therefore the relation of subsurface T-P is vertically represented by a broken-line model.T-P models of different sedimentary basins may be diverse. The common models may fall into two types; one is the high-pressure T-P model (e. g. the west slope of the Songliao basin ) , and the other is the low-pressure T-P model (e. g. the main oil-gas fields in the Taibei depression of the Tuha basin). High-pressure subsurface T-P models indicate that the fluids in a deep section have higher kinetic energy and the macroscopic connectivity in a longitudinal direction is relatively poor but that low-pressure T-P models indicate lower energy of deep fluids and good macroscopic connectivity of the strata.更多还原