叠前多属性分析在Q地区煤层气预测中的应用

发布时间：2018-03-08 05:35

本文选题：煤层气　切入点：叠前AVO反演　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：随着国民经济的快速发展,我国常规的油气田资源已经满足不了日益增长的经济和生活需求。所以,非常规能源煤层气引起了业内人士更多的关注。迄今为止,我国煤层气的抽采量只占了总资源量相对较少的一部分,大部分集中在构造地质背景简单的沁水盆地与鄂尔多斯的东缘区块高阶煤。研究区Q区块的煤炭资源较丰富、热演化程度也较高,但是在煤层气的勘探开采过程中,发现单井产量偏低,且稳产期较短。因此,快速寻求检测煤层气的储层预测研究方法刻不容缓。本文是通过叠前多属性综合研究方法进行预测,找出研究区内较为富集的有利煤储层区域。针对研究区断裂系统进行重新整理、组合及分析,并基于二维地震剖面的精细构造解释完成下石盒子组的骆驼脖子砂岩顶面、3#煤层顶面、15#煤层顶面、奥陶系的灰岩顶面层位的构造图编制,落实构造圈闭的数量和面积。再结合研究区纵横波测井资料,分析出3#煤层测线曲线“三高两低”的储层特性,并对声波和密度曲线进行井曲线的标准化;完成工区探井的岩石物理参数正演,优选出与工区最为匹配的岩石物理正演的模型,即Xu-White模型,通过Xu-White模型进行流体置换来构建横波资料曲线。从叠前多属性分析煤层气有利富集区的范围,包括叠前AVO属性分析、叠前AVO纵横波联合反演和叠前FVO反演。综合获得的截距、梯度、拟泊松比、流体因子、叠前AVO与FVO的剖面、平面图进行叠合与流体展布特征的预测,定量地划分煤层气的富集区,研究结果与地震剖面、实际测井及地质资料较为符合。本文重点针对3#煤层进行叠前多属性综合分析,再结合目的层的物性、含气性、圈闭背景,定量地划分煤层气的富集区,形成一套综合地震属性、叠前AVO纵横波联合反演及叠前FVO属性的研究技术流程及思路,为类似地区的勘探开采积累了经验并提供较好的研究思路。
[Abstract]:With the rapid development of the national economy, the conventional oil and gas field resources in China have been unable to meet the increasing economic and living needs. Therefore, unconventional energy coal bed methane has attracted more attention from the industry. Up to now, The extraction of coalbed methane in China accounts for only a relatively small part of the total resources, most of which are concentrated in the Qinshui basin with simple tectonic geological background and the high-order coal in the eastern margin of Ordos. The Q block is rich in coal resources. The thermal evolution is also relatively high, but in the process of exploration and exploitation of coalbed methane, it is found that the production of single well is on the low side and the period of stable production is relatively short. It is urgent to search for the reservoir prediction method to detect coalbed methane quickly. In this paper, the prestack multi-attribute comprehensive research method is used to predict the reservoir prediction. To find out the favorable coal reservoir area in the study area, to rearrange, combine and analyze the fault system in the study area, Based on the fine structure interpretation of 2-D seismic profile, the structural map of the top surface of the Camel neck sandstone top of the Camel neck sandstone and the top of the limestone roof of the Ordovician is compiled on the basis of the fine structural interpretation of the 2-D seismic profile. The number and area of structural traps are carried out, and the reservoir characteristics of "three high and two low" logging curves are analyzed based on the longitudinal and shear wave logging data in the study area, and the acoustic and density curves are standardized. The forward modeling of the rock physical parameters of the exploration well in the working area is completed, and the model of rock physics forward modeling, that is, the Xu-White model, which is the best match between the work area and the exploration well, is selected. The shear wave data curve is constructed by fluid replacement with Xu-White model. The range of prestack AVO attribute analysis, prestack AVO P-S wave inversion and prestack FVO inversion are analyzed from prestack multi-attribute analysis. Gradient, pseudo-Poisson 's ratio, fluid factor, prestack AVO and FVO profiles, plane maps to predict superposition and fluid distribution characteristics, quantitative division of coalbed methane rich areas, the results and seismic profiles, The actual logging and geological data are in good agreement. In this paper, the prestack multi-attribute comprehensive analysis is carried out in order to quantitatively divide the rich areas of coalbed methane in combination with the physical properties, gas-bearing properties and trap background of the target layer. A set of synthetic seismic attributes, prestack AVO P-S wave inversion and prestack FVO attributes are formed, which have accumulated experience and provided better research ideas for exploration and mining in similar areas.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.4

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