An unconventional reservoir is ＇characterized by complex conditions of hydrocarbon accumulation and a variety of hydrocarbon migration and accumulation mechanisms, which put forward higher requirements for exploration of such a reservoir. This paper discusses some new theories for structural-low hydrocarbon accumulation of clastic rocks, and suggests that if the porosity ranges from 5% to 20% and the permeability is varied, the structural-low reservoir in oil-carrying zone or oil-discharging interface of conducting sandstone forma- tion can be formed. Such reservoirs are widely distributed in low structural regions of many basins in eastern and western China. It is point- ed out that the understandings of structural controlling and non-structural controlling reservoirs that are restricted to lithology and stratigra- phy should be broken through. And the conducting sandstone formation and the Sandstone reservoir physical property-varied zone should be found out or grasped, which are the keys from lithologic prediction to petrophysical property prediction.%分析讨论了几种新的碎屑岩构造低部位成藏新理论，认为孔隙度在5％-20％，渗透率存在变化，就可能在“输导层”中形成“过油区一泄流面”内构造低位油藏。此类油藏在中国东、西部许多盆地低位构造区分布广泛；在勘探中要打破构造控藏与非构造控藏、非构造控藏与局限于岩性或地层油藏2个认识“屏障”；成藏输导砂层的确定和砂岩储集层物性变化带从岩性预测到物性预测2个关键，为复杂油气藏勘探起到重要指导作用。
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