不整合输导层侧向非均质性及其对油气成藏的差异控制作用  

Lateral heterogeneity of unconformity structure and its differential control on oil migration and accumulation

作　　者：郭凯[1,2] 曾溅辉[1] 金凤鸣 刘涛涛 蓝宝锋 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油长城钻探工程有限公司解释研究中心,北京100101 [3]中国石油华北油田勘探开发研究院,河北任丘062552 [4]中国石油长城钻探工程有限公司地质研究院,辽宁盘锦124000

出　　处：《中南大学学报（自然科学版）》2013年第9期3776-3785,共10页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2011ZX05006-001)

摘　　要：以任丘潜山北部潜山坡为例,分析不整合半风化岩石输导层的非均质性特征,并结合物理模拟实验探讨不同类型不整合输导层的差异控油作用。研究结果表明:受岩性组成、风化淋滤及后期压实成岩作用的影响,不整合半风化岩石输导层会形成一定的侧向非均质性,且其从输导性能上可分为畅通型输导层、断续型输导层和连续型封堵层3种类型。其中,完全由高渗带构成的畅通型输导层表现为"畅通式"高效油气输导特征,油气优先充注并聚集于物性好的潜山坡顶部圈闭;而由高渗带与低渗带共同构成的断续型输导层则表现为"跳跃式"低效油气输导特征,油气优先充注并聚集于物性较差的潜山坡下部圈闭和中部内幕圈闭。不整合半风化岩石输导层的非均质性可能是决定任北潜山坡内幕储层成藏与否的重要因素之一。The lateral heterogeneous characteristics in unconformity of buried hill slope in the northern part of Renqiu buried hill were analyzed,and the migration and accumulation characteristics of different unconformity carrier beds were studied by physical simulation experiments.The results show that there may be some lateral heterogeneities in subweathered zone of unconformity controlled by composition of lithology,weathering-leaching process and later compaction.The subweathered zone can be divided into three types,i.e.,unobstructed carrier bed,disconnected carrier bed and continuous sealing bed based on its conduction capability.It is illustrated by the physical simulation experiments that the oil migration executed by unobstructed carrier bed completely composed of high permeability zones is fast and of high efficiency,and oil will firstly charge and accumulate in the unconformity trap with high permeability located on the top of buried hill slope.On the contrary,the oil migration executed by disconnected carrier bed composed of high permeability zones and low permeability zones is 'jumping' and of low efficiency,and oil will firstly charge and accumulate in the unconformity trap with low permeability located in the bottom or middle of buried hill slope.The lateral heterogeneity in subweathered zone of unconformity may be one of dominant factors controlling oil migration and accumulation in the inner reservoirs of buried hill slope in the northern part of Renqiu buried hill.

关 键 词：不整合 非均质性 石油运移 模拟实验 潜山坡 

分 类 号：P618.13[天文地球—矿床学]