济阳坳陷论文：基于波动方程法的原型盆地分析.doc

济阳坳陷论文：基于波动方程法的原型盆地分析【中文摘要】认识原型盆地的性质、恢复盆地原型是油气勘探中重要的基础问题之一,也是含油气系统分析的基础,对于准确认识盆地的演化过程,以及盆地对油气的生成、运移、聚集、成藏的影响等都具有重要的实际意义。本文在深层地震资料解释的基础上,结合钻井、测井等资料,抓住压实系数的计算和波动分析约束下的剥蚀厚度恢复两个关键因素,以原型盆地的恢复及分析为目标,为预测勘探方向提供依据。首先,在研究地层压实系数时,建立了济阳坳陷4个凹陷共16个压实系数方程。求取了各地层沉积速率,并分析得出孔二段与孔一段的沉积速率特征。通过构造沉降史的模拟和分析发现,对于同一凹陷不同位置来说,凹陷中心的地层沉降速率较大,边缘的地层沉降速率较小。在波动方程法约束下,综合取值恢复了原型盆地剥蚀量。即首先通过波动方程法建立起盆地波动方程,进而计算出地史时期地层各组、段沉积量和剥蚀量,界定区域的剥蚀厚度范围,再利用沉积速率法等多种方法等来精确恢复地层的剥蚀量。研究表明,剥蚀厚度较大的区域集中在凹陷的边缘。孔二段剥蚀主要集中在惠民凹陷和东营凹陷,剥蚀厚度最大的地方位于惠民凹陷与东营凹陷的交界处;孔一段的剥蚀厚度与孔二段类似,剥蚀厚度最大的地方位于惠民凹陷东部。基于波动方程法,对济阳坳陷孔店组原型盆地进行了波动旋回性分析,分析结果表明,几个凹陷都存在着一个周期波G或N决定凹陷不同时期的相对沉积速率,周期波L反映凹陷内不同沉积期间断面的剥蚀情况。在总的趋势上具有相似性。通过编制研究区孔店组原型盆地厚度等值线图,综合研究表明:济阳坳陷孔二期原型盆地深度最大值位于惠民凹陷的滋镇洼陷,可达2800m以上,主要发育有3个凹陷,东营凹陷和沾化凹陷厚度明显小于惠民凹陷。在孔一期,原型盆地深度最大值位于阳信地区南部,可达3800m以上。惠民凹陷和东营凹陷总体上继承与发展了孔二期盆地形态,沾化凹陷也由于构造运动开始产生影响。车镇凹陷属于相对“平静期”,基本未沉积孔二段和孔一段地层。【英文摘要】Understanding the nature of prototype basin and restoring basin prototype is oneof the important foundations in oil and gas exploration, for the accurate understandingof the evolution of the basin, and the basins of oil and gas generation, migration,accumulation has showed important practical significance. In this paper, based onjoint application of seismic data interpretation and the drilling and logging data,compaction coefficient can be computed and denudation recovery can be restored bywave analysis, as the two key factors provide the basis for forecasting the targets ofexploration.First, 16 compaction coefficient equation of 4 depressions have been establishedthrough the compaction coefficient computation in Jiyang depression. During thisstudy, the deposition rate of Ek2 and Ek1 has been obtained and the deposition ratecharacteristics showed that the subsidence rate is fast at the depression center but slowat the edge.Prototype basin denudation after comprehensive analysis is recovered withrestriction of the wave equation. First, a wave equation should be established, whilethe distribution scale definition is accomplished, the denudation of every group can becomputed. The results show that most high denudation areas are concentrated at theedge of depression. Ek2 denudation area mainly distributes in Huimin depression andDongying depression, the highest denudation appears at the boundary of Huimindepression and Dongying depression. The denudation of Ek1 is similar to Ek2, whilethe highest denudation appears at east area of Huimin depression.The wave cycle analysis, based on wave equation method, showed that forKongdian prototype basin in the Jiyang depression, periodic wave G or N decides therelative deposition rate during different periods, periodic waves L reflects thedenudation at hiatus surface in different depressions, but the trend is similar.The contour map of Kongdian thickness of the prototype basin shows that: themaximum depth of Ek2 prototype basins in Jiyang depression locates in the Zizhen sag of Huimin Depression, up to 2800m or more, there are 3 major depressions. Thethickness of Dongying and Huimin depression is smaller than the thickness ofZhanhua depression. During Ek1 period, the maximum depth of prototype basinslocated in the southern region of Yangxin sag, up to 3800m or more. The morphologyof Dongying and Huimin depression develop from the whole Ek2 basin morphology.Zhanhua depression is also affected by tectonic movement. While Chezhen depressionshows“quiet”as Ek1 and Ek2 formation is hardly deposited here.【关键词】济阳坳陷 孔店组 剥蚀厚度 波动方程法 原型盆地【英文关键词】Jiyang Depression Kongdian Formation Erosion amount WaveEquation Method Prototype basin【目录】基于波动方程法的原型盆地分析摘要5-6Abstract6-70 前言10-140.1 选题的目的和意义100.2 国内外研究现状10-110.3 主要研究内容及技术路线11-130.3.1 研究内容11-120.3.2 技术路线12-130.4 主要创新点13-141 区域地质概况14-191.1 基本构造格架14-181.1.1 构造位置14-151.1.2 断裂特征15-181.2 构造演化阶段18-192 地层厚度与压实分析19-402.1 年代地层格架的确定19-212.2 地层古厚度恢复21-262.2.1 残余地层古厚度恢复212.2.2 原始厚度的恢复21-262.3 地层压实系数的研究26-272.3.1 压实系数的计算262.3.2 建立压实系数数学模型26-272.4 沉积速率的求取及分析27-312.4.1 孔二段沉积速率特征29-302.4.2 孔一段沉积速率特征30-312.5 构造沉降史模拟与分析31-403 剥蚀厚度的恢复40-663.1 剥蚀厚度恢复的方法40-413.2 波动方程法41-543.2.1 研究方法42-463.2.2 波动方程拟合46-533.2.3 剥蚀厚度范围的求取53-543.3