东营凹陷古近系深层砂砾岩油气藏差异化形成机理及模式  

Differential formation mechanism and model of Paleogene deep sandy conglomerate reservoirs in the Dongying sag

作　　者：雷文智 陈冬霞[1,2] 成铭 王永诗[4] 巩建强[5] 邱贻博[5] 王翘楚 蔡晨阳 张婉蓉 LEI Wenzhi;CHEN Dongxia;CHENG Ming;WANG Yongshi;GONG Jianqiang;QIU Yibo;WANG Qiaochu;CAI Chenyang;ZHANG Wanrong(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;College of Geosciences,China University of Petroleum,Beijing 102249,China;Changbei Operating Company,Petrochina Changqing Oilfield,Yulin,Shaanxi 719100,China;Shengli Oilfield Company,Sinopec,Dongying,Shandong 257001,China;Research Institute of Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying,Shandong 257015,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油长庆油田公司长北作业分公司,陕西榆林719100 [4]中国石化胜利油田分公司,山东东营257001 [5]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《地质学报》2025年第3期929-944,共16页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41972124)资助的成果。

摘　　要：东营凹陷深层砂砾岩油气勘探潜力大,揭示油气在空间上的分布差异以及形成机理有利于深入认识深层油气成藏过程。本研究通过有机地球化学、储层流体包裹体以及盆地模拟等多种分析方法,明确了东营凹陷深层油气特征及差异,揭示了烃类流体的差异化形成机理及模式。结果表明,东营凹陷盐家地区从深至浅呈干气、凝析气和轻质油垂向有序分布;胜坨地区以单一油相为主,不同类型油气藏的原油伴生气组分存在差异。导致深层烃类流体差异化的因素体现在生成、改造和保存等方面,砂砾岩中的油气成藏过程具有较强的继承性,烃源岩的热演化史决定了油气的初始相态。后期次生改造作用的影响依赖于流体环境,输导性扇体叠置形成的开放流体环境有利于气侵过程的发生,促使油气在垂向上相态分异;油气在相对封闭的环境中常维持单一相。此外,断层的输导作用可导致油气中发生轻组分的损失,同样是导致烃类流体差异化的重要因素。基于烃类流体的分布特征和成因机制的认识,建立了热演化-次生改造主导的烃类相态垂向分异型和热演化-断层输导主导的气烃组分分异型两种烃类流体差异化形成模式。东营凹陷深层烃类流体差异化形成机制的认识可为预测深层不同类型烃类流体分布提供一定的科学指导。Deep sandy conglomerate reservoirs in the Dongying sag have significant potential for oil and gas exploration.Under standing the spatial distribution and formation mechanism of petroleum in these reservoirs is crucial for comprehending deep oil and gas accumulation processes.This study employed organic geochemistry,reservoir fluid inclusions,and basin simulation to clarify the characteristics and differences of deep oil and gas,revealing their distinct formation mechanisms and models.Results show a vertical distribution of hydrocarbon fluids in the Yanjia area of the Dongying sag,with dry gas,condensate gas,and light oil occurring from deep to shallow.In contrast,the Shengtuo area is dominated by oil phase,with varying associated gas components in different reservoir types.The differentiation of deep hydrocarbon fluids is attributed to variations in generation,reconstruction,and preservation processes.The hydrocarbon accumulation process in the sandy conglomerates has a strong succession.The thermal evolution history of the source rock determines the initial petroleum phase,while subsequent secondary alteration influenced by the fluid environment plays a significant role.The overlapping transport fan creates an open fluid environment that facilitates gas invasion,promoting vertical phase differentiation of oil and gas.Conversely,a relatively closed environment tends to maintain a single-phase oil and gas system.In addition,fault transport can lead to the loss of light components in oil and gas,further contributing to hydrocarbon fluid differentiation.Based on the understanding of the distribution characteristics and genetic mechanisms of hydrocarbon fluids,two distinct formation models were established.The first model highlights the vertical differentiation of hydrocarbon phase state types,primarily driven by thermal evolution and secondary alteration.The second model emphasizes gas component differentiation,influenced by thermal evolution and fault transport.Understanding the differential formation mechanisms of

关 键 词：东营凹陷 北部陡坡带 砂砾岩体 深层油气 烃类流体差异化成因 

分 类 号：P61[天文地球—矿床学]