陕北富县探区古生界勘探潜力分析

Exploration Potential Analysis of the Paleozoic Erathem in Fuxian Exploration Region in the North of Shanxi Province

李春玉¹,刘绍光¹,刘新刚¹,魏承军²

Li Chunyu，Liu Shaoguang, Liu Xingang, et al

1. 中原油田分公司勘探开发科学研究院,2. 中原石油勘探局组织部

Research Institute of Petroleum Exploration and Development, Zhongyuan Oilf ield Company, SINOPEC, Henan 457001, P. R. China

上古生界气源岩巨大的排气量和持续的供气能力是古生界气藏富集的基础, 天然气早期以垂向和侧向运移为主, 晚期就近运移聚集, 为古生界特别是上古生界大面积含气提供了有利条件。稳定的构造背景和多套盖层良好的封盖能力构成了古生界天然气保存的有利条件。下古生界风化壳发育和上古生界有利砂体分布是古生界气藏成藏的关键条件。做好储层预测, 寻找有利的储层发育带, 对陕北富县探区的古生界天然气勘探有着重要意义。

The enormous amount of natural gas generated from gas source rock of Paleozoic erathem and continuous gas supply ability is the base of the concertrated gas reservoirs. The gas migrates mainly in vertical and lateral direction at the early stage, while at the later stage, in shorter distance, which provide advantageous conditions for the forming of wide area gas reservoirs. The tectonic movement is weak and the sealing ability of the mult i-caprocks is good, which is beneficial to the preservation of natural gas. The key elements that deermine the forming of gas reservoir are the weathering crust developed in lower Paleozo icerathem or the sandbody developed in upper Paleozoic erathem. Therefor, to find advantageous weathering crust and sandbody by using seismic data is very important to the natural gas exploration in Fuxian region.