摘要
旧州斜坡带作为廊固凹陷关键的二级含油构造带之一,近年来在勘探方面未有新的进展,勘探程度相对较低,但剩余资源颇为丰富。针对旧州斜坡带浅层构造特征认识不清、岩性圈闭高点难以精准把控,以及油气富集规律认识不足等问题,深入开展综合地质研究,通过多维断层分析重塑区域目标构造格架;同时,从生储盖组合、圈闭类型、储层砂体与构造耦合发育等层面展开评价,构建了全新的成藏模式。研究结果表明:旧州斜坡带浅层沙三上亚段上部主要为构造油气藏,侧向封堵对其油气成藏至关重要;中浅层沙三上亚段中下部至沙三中亚段主要为构造-岩性油气藏或岩性油气藏,储层的发育程度及展布特征是其油气成藏的关键因素。在此基础上进行综合评价,优选出ZH 22井区构造-岩性圈闭、X 5井区南部构造-岩性圈闭两个有利目标,预测圈闭资源量累计达1062.1×10^(4)t,均可兼探多层目标且埋藏较浅,为该区域新一轮油气突破及储量规模发现奠定了坚实基础。
As one of the key secondary oil-bearing structural belts in the Langgu Sag,Jiuzhou slope belt has not made any new progress in exploration in recent years,with a relatively low level of exploration but abundant remaining resources.Aiming at the problems of unclear understanding of shallow structural features,difficult to accurately control the high points of lithologic trap and insufficient understanding of oil and gas enrichment rules for shallow Jiuzhou slope belt,this paper carried out a comprehensive geological study,and reshaped the regional target tectonic framework through multi-dimensional fault analysis.At the same time,a new accumulation pattern was constructed by evaluating sources-reservoir-cap assemblages,the type of trap,and the coupling development of reservoir sand body and structure and other aspects.The results show that the upper part of the upper sub-member of Sha-3 member in shallow Jiuzhou slope belt is mainly a structural reservoir,and lateral blocking is crucial to its hydrocarbon accumulation.The middle and lower parts of the upper sub-member of Sha-3 member to middle sub-member of Sha-3 member in middle-shallow Jiuzhou slope belt are mainly structural-lithologic reservoirs or lithologic reservoirs,and the development degree and the distribution characteristics of the reservoirs are the key factors for its hydrocarbon accumulation.Based on the comprehensive evaluation,two favorable targets,structural-lithologic trap in wellblock ZH 22 and structural-lithologic trap in southern part of wellblock X 5,were optimized,the resources quantity of the traps was predicted to reach 1062.1×10^(4)t,both of which could be used to explore multi-layer targets with shallow burial,laying a solid foundation for the new breakthroughs in oil and gas and scale discovery of the reserves in this area.
作者
张君子
樊晟阳
黎铖
李娟
刘朔
ZHANG Junzi;FAN Shengyang;LI Cheng;LI Juan;LIU Shuo(No.2 Mud Logging Company,BHDC,CNPC,Renqiu,Hebei 062552,China;Liaodong Operating Company of CNOOC China Limited Tianjin Company,Tianjin 300452,China)
出处
《录井工程》
2024年第4期124-130,共7页
Mud Logging Engineering
关键词
勘探潜力
廊固凹陷
旧州斜坡带
构造-岩性圈闭
成藏模式
exploration potential
Langgu Sag
Jiuzhou slope belt
structural-lithologic trap
accumulation pattern
