摘要
主要应用地震 -沉积相的工作方法研究了渤海湾盆地老第三纪地层发育及地震相的特点 ,解释地震剖面 ,并转化为沉积相 ,在此基础上对油气勘探的有利区带作出预测。研究工作强调了地质模型的作用 ,并用岩芯的资料及单井的沉积相分析来约束地震解释。指出地质模型约束地震解释 ,是克服地震多解性、提高解释精度的有效方法 ,更好地发挥地震横向预测的作用。地质模型主要据“四扇一沟”的模式来构建 ,其依据是在渤海湾的沙河街组及东营组 ,其储层砂体主要是由在深湖条件下 ,在凸起的边缘上 ,往往有扇三角洲、三角洲、湖底扇组成 ,它们的分布区 ,往往就是油气勘探的有利区。研究发现 ,区内凡是凸起边缘若发育了断层 ,就有可能促使湖底扇的发育。在渤中的老第三系 ,浊流比较发育 ,因而 。
This paper mainly deals with Lower Tertiary strata and seismic facies of the Bohai Basin based on analysis of seismis sedimentary facies. According to the interpretation of seismic section and the character of seismic facies and sedimentary facies, the authors predict the beneficial zone for oil and gas exploration . The authors emphasize the role of geology model and constrain the seismic interpretation according to the data from drilling core and well logging. The authors find that geology model constraint is a proper method to overcome the uncertainty of seismic interpretation and can help us improve the accuracy of seismic interpretation and transverse prediction . The model in this paper is built according to a sedimentary theory: during the stage of the Shahejie Formation and Dongying Formation, the reservoir sandbody of deep lake consists of fan delt, delt, and sub lacustrine fan, and the distribution of these areas belongs to a beneficial zone for oil and gas exploration . On the side of uplift, the fault causes the development of sublacustrine fan. The turbidite facies is common and important to oil gas exploration. The authors also find that the lacutrine fan consists of root fan, middle fan, and front fan, and the mian reservoir is located in the middle fan. The fan delt and delt also consist of three parts, and the middle parts are also the main reservoirs. The recognization of fan delt, delt, sublacustrine fan and trench is very important to oil and gas exploration. According to the analysis of sedimentary facies and thickness, the authors find that the area surrounding Bz6 1 1 is the center of sedimentation and subsidence and hydrocarbon generation during the stage of the third member of the Shahejie Formation and the lower part of the Dongying Formation. Trap types include lithology , structure, and paeleo burial uplift. The lacustrine fans develop beside the uplift. The Bz6 1 1 and QHD34 2 1, are the center of sedimentation, and the source rocks, reservoir rocks and cover rocks develop well there. So they have great potential for future exploration. Although the Bz25 1 1 and Bz34 2 1 are the center of sedimentation during the stage of the third member of the Shahejie Formation, they experienced uplift at the end of the Dongying Formation, so they may not have the same potential as Bz6 and QHD34, but they may have stuctural traps, if the source of hydrocarbon is enough for oil and gas generation.
出处
《成都理工学院学报》
CSCD
北大核心
2002年第1期41-48,共8页
Journal of Chengdu University of Technology
关键词
地震相
沉积相
储层预测
沙河街组
东营组
地质模型
渤中凹陷
油气勘探
seismic facies
sedimentary facies
reservoir prediction
Shahejie Formation
Dongying Formation
geology model
