论油气分布的不均一性(Ⅰ)——非均质控油理论的由来

在概述了油气成藏理论和油气分布规律研究现状的基础上，首次系统总结了岩性油气藏发育区的油气不均一分布特征，详细论述了油气不均一分布的影响因素及其成因机制。油气不均一分布具有层次性，不同层次的油气不均一分布的主控因素也有所不同：沉积凹陷的油气分布不均一性，可以用油源以及圈闭条件来进行解释；沉积凹陷内某一区带（如洼陷带）内部的油气不均一分布，除了受油源和构造条件制约，还明显受到储集条件非均质性的影响；造成区带内单一砂体或油藏内部油气不均一分布的根本原因则是储层非均质性。储层非均质性影响油气成藏、导致油气不均一分布是文章强调的核心思想。油气不均一分布是一种普遍现象和客观规律，尤其对于包括岩性油气藏在内的隐蔽油气藏以及包括古潜山油气藏在内的各种复杂油气藏，这一现象更加明显。油气不均一分布的提出对于岩性油气藏和复杂油气藏的勘探以及高勘探程度区的精细勘探和开发具有启示作用。

Research on the heterogeneous distribution of petroleum (Ⅰ)

On the basis of the current research on the hydrocarbon accumulation theory and hydrocarbon distribution rules, the theory of hydrocarbon heterogeneous distribution was definitely put forward. The effect factors and the forming mechanisms for the hydrocarbon heterogeneous distribution have been discussed in detail. The heterogeneous distribution of hydrocarbon has several levels, of which the main affecting factors are different. In sub-depressions, oil source and trap conditions were the main factors controlling heterogeneous distribution of petroleum macroscopically. In the secondary block, the heterogeneous distribution is controlled by oil source, structural conditions, in addition to the reservoir heterogeneity. The heterogeneous distribution of single sand body or the interior reservoir was resulted from reservoir heterogeneity. The idea that reservoir heterogeneity affects the hydrocarbon accumulation and leads to heterogeneous hydrocarbon distribution was stressed here. The phenomenon that hydrocarbons distribute heterogeneously in different scale is universal and objective, and it is even obvious in the subtle and complex reservoirs, including lithologic reservoirs and buried-hill reservoirs and so on. The presentation about the theory of hydrocarbon heterogeneous distribution takes a significant part in the exploration of lithologic reservoirs and complex reservoirs, and the fine exploration and development in highdegree exploratory areas.