隐蔽油气藏勘探理论体系再认识

Recognition of Theoretical System of Subtle Reservoirs Exploration

随着我国油气工业的不断发展,隐蔽油气藏已经逐渐成为油气藏勘探的主要类型,其勘探理论及勘探手段也得到了快速发展。通过对隐蔽油气藏勘探理论的系统分析表明,截至目前层序地层学、古地貌、坡折带和油源控制4大理论有效地指导了隐蔽油气藏形成机制及分布规律研究。三级层序不整合面上、下空间和低位体系域为隐蔽油气藏发育的有利场所,不整合面自身的疏导能力和封闭机理是隐蔽油气藏形成的主要因素,低位体系域中丰富的储集体和良好的空间配置为油气富集提供了条件。古地貌与坡折带制约着储集体的空间展布及汇聚沉积特征,指导了隐蔽储集体的横向追踪。优质烃源岩与储集层的位置关系可以为精确预测隐蔽油气藏发育范围提供思路。

Subtle reservoir has been gradually becoming the main field of oil and gas reservoirs exploration,and it is rapidly developed for their theories and exploration methods.Four theories like as sequence stratigraphy,paleogeomorphic,slope-beak zone and source-constrained oil have guided the formation mechanism of subtle reservoir and distribution.The space above and under the unconformity surface and low stand system in the third-order sequence is a favorable place for subtle reservoir.The transport and seal for unconformity surface itself is the key factor for subtle reservoir formation.The palaeogeomorphology and slope-beak zone constrained the spatial distribution of reservoir and hydrocarbon accumulation gave a guide for horizontally tracing the subtle reservoir.The location of high-quality source rock and reservoir would predict the scope of subtle reservoir.