琼东南盆地北礁古隆起控油气模式

A Model for Controlling Hydrocarbon Accumulation in the Beijiao Palaeouplift of Qiongdongnan Basin

通过对琼东南盆地北礁古隆起形成演化的恢复及古隆起石油地质条件综合研究,明确了该古隆起经历过3期构造演化过程,即裂陷期、热沉降期、新构造期;阐明了古隆起控油气作用原理,即古隆起发育多种类型圈闭,具有多种输导体系,是浮力作用下油气运聚的有利指向区;建立了北礁古隆起2类控藏模式,即"山外"型油气藏模式、"山内"型油气藏模式。

In this paper, the tectonic evolution of the Beijiao palaeouplift has been reconstructed, and the comprehensive study of petroleum geology has been conducted. It has been made clear that the Beijiao palaeouplift has experienced three tectonic evolution phases, including, rift phase, depression phase, new tectonic activity phase. The mechanism of the HC accumulation controlled by the palaeouplift, has been discussed. In palaeouplift area, there are various kinds of traps and HC migration systems, which are favorable for hydrocarbon migration and accumulation. Two kinds of HC accumulation model have been established for the Beijiao palaeou- plitt, namely inner of buried hill HC accumulation model, outside of buried hill HC accumulation model. These play a guiding role effectively for oil and gas exploration of the Beijiao palaeouplift.