元坝地区珍珠冲段天然气优势运移通道探讨

川东北元坝地区下侏罗统自流井组珍珠冲段储层具有一定的天然气资源潜力，但天然气分布规律不清，制约 了勘探方向的选择，亟待开展与天然气分布密切相关的优势通道的研究。利用钻井、地震等资料，通过对元坝地区珍 珠冲段储层中影响天然气运移方向的地质因素的分析，明确了较高孔渗输导砂体、断层、不整合面、构造背景及盖层底 面构造形态等5 种主控因素。同时对各种主控因素与天然气运移方向相互关系的综合分析，提出了元坝地区珍珠冲 段储层中天然气优势运移通道的2 种模式：（1）沿砂体断层复合通道运移；（2）沿砂体不整合面复合通道运移；其 中第一种模式更有利于天然气富集高产。进而分层次指明下一步勘探的方向。

Discuss on the Natural Gas Dominant Migrating Channel of#br# Zhenzhuchong Segment in Yuanba Area

The reservoir of the Jurassic Ziliujing formation Zhenzhuchong Segment in Yuanba area of northeast Sichuan Basin possesses good potential with natural gas resources. But the distribution of gas is not clear，so it limits the selection of the exploration direction. The research on the dominant migrating channel of gas needs to be carried out. In this paper，taking advantage of drilling and seismic data，the author detailedly analyzes the geological factors that could affect gas migratory direction in Zhenzhuchong Segment of Ziliujing Formation reservoir. Meanwhile it defines five kinds of main controlling factors which include higher permeability conducting sand body、fault、unconformity surface、tectonic background and structure form of cover bottom. By researching the relationship between each main controlling factor and gas migration direction，the author puts forward two models of dominant migrating channel of Zhenzhuchong Segment in Yuanba area. The first is along the sand body-fault composite channel，and the second is along the sand body-unconformity surface composite channel. The first one is more favorable for high gas concentrating. And then it effectively indicates the future exploratory direction.