浅层侵入体泥岩变质带储集特征及发育模式—以江苏高邮凹陷北斜坡侵入体泥岩变质带为例  

Reservoir characteristics and development model of mudstone metamorphic belts around the near-surface intrusions: a case study in northern slope of Gaoyou Sag,Jiangsu Province

作　　者：李丹[1] 孙建[2] 何娇娇[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中油大港油田分公司,河北沧州061035

出　　处：《世界地质》2014年第1期164-170,共7页World Geology

基　　金：中央高校基本科研业务费专项资金项目(11CX06005A)

摘　　要：对江苏高邮凹陷北斜坡浅层侵入体泥岩变质带储集特征及发育模式开展的研究表明,泥岩变质带厚度与侵入体厚度呈正相关关系,按变质程度差异分为3个岩相带:角岩带、板岩带和变余泥岩带。其储集空间以各种成因的裂缝为主,物性变化受热接触变质作用控制,越靠近侵入体储层物性越好,即角岩带物性好于板岩带及变余泥岩带。岩浆侵入带来的高温高压、热流体活动及冷凝收缩作用是泥岩变质带储层发育的主要动力机制;侵入体上下变质带多呈非对称发育,上部变质带厚度及物性均优于下部变质带,这种非对称发育特征主要受控于高压热流体向上优势运移作用;其中上部角岩带为泥岩变质带相对优质储层发育部位。通过分析岩浆侵入与油气运聚的时空匹配关系认为泥岩变质带具有较大成藏潜力。Reservoir characteristics and development model of mudstone metamorphic belts around the nearsurface intrusions are studied in northern slope of Gaoyou Sag.The results show that there is a positive correlation between the thickness of the mudstone metamorphic belts and the thickness of the intrusions,and the mudstone metamorphic belts are divided into three lithoface zones by different metamorphic grades,i.e.hornfels-,slateand blastopelitic zones.The dominant reservoir space formed by fractures of various genesis,and the petrophysical property variation is controlled by the contact metamorphism.The closer to the intrusions,the better its petrophysical property would be.The petrophysical property of hornfels zone is better than that of slate zone and blastopelitic zone.The high pressure and temperature,thermal fluid activities and condensing contraction,as a result of the intrusion,are the main dynamic mechanisms of the development of reservoir in the mudstone metamorphic belts.The mudstone metamorphic belts with an asymmetry development are above and below the intrusions,and the upper mudstone metamorphic belt is better in thickness and petrophysical properties than the bottom mudstone metamorphic.That is controlled by the upward dominant migration of the thermal fluid with high pressure.The upper hornfels zone is the relatively high-quality reservoir in the mudstone metamorphic belts.It is estimated that the mudstone metamorphic belts present an considerable accumulation potential through the analysis of the matching relation between the magma intrusion and hydrocarbon accumulation.

关 键 词：浅层侵入体 泥岩变质带 储集物性 非对称发育模式 高邮凹陷 江苏 

分 类 号：P618.130[天文地球—矿床学]