东濮凹陷深层气勘探新思路  

SOME NEW THOUGHTS FOR DEEP NATURAI, GAS EXPLORATION IN DONGPU SAG

作　　者：刘秋生[1] 谢秀祥[1] 肖斌[1] 

机构地区：[1]中原石油勘探局勘探开发科学研究院,河南省濮阳市457001

出　　处：《石油勘探与开发》1997年第4期12-15,共4页Petroleum Exploration and Development

摘　　要：东噗凹陷以深层天然气资源丰富而著称，但多年来的数十日深井钻探效果不理想。人们将其原因归结为“储集层物性差”，即使局部存在良好储集层也“难以捉摸”。这是以“深盆气”为模式，以岩性和小村造圈闭为对象进行钻探得出的结论。通过综合研究认为，东濮凹陷的洼陷带中存在规模较大的古构造，圈闭条件好，它们的形成时期与油气生成、运聚时期相匹配，因而较早捕获油气，并使圈闭范围内的储集层保留了较好的原始孔隙，减缓或抑制了水化学作用导致的储集物性变差，是深层天然气勘探的有利目标。提出洼陷带深层气勘探仍应以构造圈闭为主要对象的认识，认为西部洼陷带南部的长垣断裂构造带和李家-林寨村造群是深层气勘探的有利地区。Dengpu sag is well known for.its rich deep-lying natural gas resources. Explorations by drilling several dozen deep wells have been done in the past years, but with no satisfactory results. Deep-lying gas is difficult to be handled even in the area with locally better reservoir conditions. People attribute this to the poor physical properties of the reservoir rocks. The above recognition is just based on deep-hasin gas' pattern and drillings of lithological and small structural traps. ln this paper, we discussed the distribution rules of the physical properties of the deep reservoir rocks and got the conclusion that: The paleostructures in the sag are on a large scale with better sealing conditions, which are matched better with the timing for hydrocarbon generation and migration. Since hydrocarbons were captured in early stages, the reservoirs in the trap area had no environment for hydrochemical reaction which would retard and restrain the worsening of physical properties in the later period, and preserved the original better porosities. On the basis of all the above knowledegs, we put forward that the exploration of deep gas in the sag should mainIy be focused on the structural traps, and also point out that faulted zone of the placanticline in the south part of the western sag belt and the Lijia-Linzhai structure group should be the favorable areas for deep gas exploration.

关 键 词：凹陷 深层气 古构造 构造油气藏 储集层 

分 类 号：P618.130.2[天文地球—矿床学]