摘要
鄂尔多斯盆地高家堡区块马五段发育膏岩、盐岩和碳酸盐岩,其走滑断裂结构复杂、垂向分布差异大,对油气的运聚具有重要影响。针对马五段的断裂系统分层分布现象,采用导航金字塔处理方法对地震数据进行多尺度、多方向的分级与重构处理,提高对复杂断裂边界的识别和表征能力,并细分小层建立高分辨率地层解释格架对各小层进行独立解释,结合多属性优选与属性融合方法有效识别了断裂分布,揭示了断裂的空间分布和演化规律。结果表明:①研究区走滑断裂发育,在平面上主要为NNE、NNW走向的直线、折线状断裂,以平行、雁行状分布为主,伴生有雁列状次级小断裂;在剖面上,马五段断裂具有高角度、近直立分布的特征,垂直方向上位移较小,断裂样式以“Y”字形断裂、花状断裂、高陡直立断裂及反“Y”字形断裂为主。②马五段中下部发育多套膏盐层,对下伏深层断裂的向上发育具有不同程度的消解作用,最终导致了马五段断裂具有垂向分层分布的特征,随着断裂向上切穿膏岩、盐岩层数与厚度的增加,断裂被消解的程度逐渐增大,盐下大多数断裂最终消亡在马五6亚段内部。③在马五段中上部(马五5—马五1亚段),随着大量断裂的消亡,仅MT2井区因强烈的构造作用,强大的应力使膏岩、盐岩层流动引发上覆地层的垂向变形产生隆起构造,应力向上传递而形成新的断裂系统。
Gypsum rock,salt rock and carbonate rock are developed in the fifth member of Majiagou Formation(Ma 5 Member)of Gaojiabao Block in Ordos Basin.The strike-slip fault structure is complex and the vertical distribution is different,which has an important influence on the migration and accumulation of oil and gas.In view of the layered distribution of the fault system in the Ma 5 Member,the navigation pyramid processing method is used to classify and reconstruct the seismic data in multi-scale and multi-direction,so as to improve the ability to identify and characterize the complex fault boundary,and subdivide the small layers to establish a high-resolution stratigraphic interpretation framework for independent interpretation of each small layer.Combined with multi-attribute optimization and attribute fusion methods,the fault distribution is effectively identified,and the spatial distribution and evolution of faults are revealed.The results show that:(1)The strike-slip faults in the study area are developed.On the plane,they are mainly NNE and NNW trending linear and broken linear faults,which are mainly distributed in parallel and echelon,accompanied by echelon secondary small faults.On the section,the fault of Ma 5 Member has the characteristics of high angle and nearly vertical distribution,and the displacement in the vertical direction is small.The fault patterns are mainly'Y'-shaped faults,flower-like faults,high-steep vertical faults,and reverse'Y'-shaped faults.(2)Several sets of gypsum-salt layers are developed in the middle and lower part of the Ma 5 Member,which have different degrees of digestion effect on the upward development of the underlying deep faults,and finally lead to the vertical layered distribution of the Ma 5 Member faults.As the faults cut upward through increasing numbers and thicknesses of gypsum and salt layers,the degree of fault dissolution gradually increases,with most sub-salt faults eventually disappearing within the sixth section of Ma 5 Member.(3)In the middle and upper parts of Ma 5 Member(the fifth section of Ma5-the first section of Ma 5),with the demise of a large number of faults,only the MT2 well area,due to intense tectonic activity,the strong stress caused the flow of gypsum rock and salt rock,leading to the vertical deformation of overlying strata and the formation of uplift structures.The stress was transmitted upwards,resulting in a new fracture system.
作者
刘世民
周路
马占荣
陆鹏
张才利
罗晓容
吴勇
任奕霖
苏金鹏
LIU Shimin;ZHOU Lu;MA Zhanrong;LU Peng;ZHANG Caili;LUO Xiaorong;WU Yong;REN Yilin;SU Jinpeng(Sichuan Key Laboratory of Natural Gas Geology,School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;Exploration Department,PetroChina Changqing Oilfield Company,Xi'an 710018,China;Southwest Branch,CNPC Logging Company Limited,Chongqing 400021,China;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi’an 710018,China;Department of Geology,Northwest University,Xi'an 710069,China)
出处
《天然气地球科学》
北大核心
2025年第8期1473-1490,共18页
Natural Gas Geoscience
基金
中国石油长庆油田分公司科技攻关项目“鄂尔多斯盆地中元古界—奥陶系构造沉积演化、成源机制与勘探新领域”(编号:ZDZX2021-05)资助。
关键词
高家堡区块
走滑断裂
地震数据挖掘
多属性优选
属性融合
Gaojiabao block
Strike slip fault
Seismic data mining
Multi-attribute optimization
Attribute fusion
作者简介
刘世民(1995-),男,四川达州人,博士研究生,主要从事碳酸盐岩储层方面研究.E-mail:1409064189@qq.com;通信作者:周路(1962-),男,四川广安人,博士,教授,博士生导师,主要从事地震资料解释、地震岩性与储层预测等方面教学与研究.E-mail:zhoulu9@126.com.
