辽河坳陷清水洼陷沙三段沉积特征与有利区预测

发布时间：2018-04-27 11:11

本文选题：清水洼陷 + 层序地层格架建立　；参考：《东北石油大学》2015年硕士论文

【摘要】：近年来,辽河西部凹陷对中浅层的勘探已经趋于高成熟,清水洼陷作为其油气生产主力区,后备资源不足且油气勘探的难度越来越大。为了进行油气精细勘探,层序地层格架的建立是必不可少的重要基础,具有十分重要的实践意义。本文针对辽河清水洼陷沙三段,以岩心观察分析资料为基础,利用电测曲线、地震资料等开展对地层格架建立的深入研究。通过岩心观察,结合岩石相、沉积构造类型等特征,确定该区沉积亚相类型,完成各层平面相带展布,结合地震相完成有利储层预测。由于深层研究资料较少、研究层段巨厚且厚度变化较大,前人对该区的层序划分有不同见解,仅利用电测曲线无法对研究层段进行准确的对比。因此在做层序划分时结合了地震资料上超、下超、顶超、削截的特征,和电测曲线上高阻值、低伽马、低声波时差的特点,从而对界限位置进行准确划分。通过对清水洼陷沙三段的层序地层研究,将沙三段划分为一个二级层序、三个三级层序、六个四级层序,总结出该区块研究层段内电性特征、岩性特征等。沙三段二级层序底界面地震剖面上连续性好,地层上超及局部削截,岩性及颜色发生突变;二级层序顶界面在地震剖面上表现为一个强振幅、连续性较好的地震反射同相轴。界面之上为明显上超,界面以下为平行接触。将Es31段划分为两个四级层序,Es32段划分为三个四级层序,Es33一个四级层序。在此基础上,对研究区内重点取心井进行了岩心资料观察,结合岩芯内岩石相、沉积构造类型、泥砾特征、垂向上岩石相组合等特征,判断该区主要亚相类型为湖底扇中扇亚相,以此为基础建立测井相模式。对该区目的层段内平面沉积相进行分析,完成Es33、Es32下部、Es32中部、Es32上部、Es31下部、Es31上部的平面相带展布。最后利用地震剖面对有利储层进行预测,优选有利储层,为该区油气勘探提供地质依据。
[Abstract]:In recent years, the exploration of the middle and shallow layers in the western depression of Liaohe has become more mature. As the main oil and gas production area of Qingshui depression, the reserve resources are insufficient and the exploration of oil and gas is becoming more and more difficult. In order to carry out oil and gas fine exploration, the establishment of sequence stratigraphic framework is an essential foundation and has very important practical significance. In this paper, based on the core observation and analysis data, the formation framework of the third member of Liaohe Qingshui sag is studied by means of electric survey curve and seismic data. Through core observation, combined with the characteristics of lithofacies and sedimentary structure, the sedimentary subfacies in this area are determined, the distribution of each layer plane facies belt is completed, and the favorable reservoir prediction is completed in combination with seismic facies. Because of the lack of deep research data and the great thickness and thickness of the study interval, the former people have different opinions on the sequence division of the study area, and it is not possible to accurately contrast the study layer by using only the electric survey curve. Therefore, combining the characteristics of upper, lower, top, truncated seismic data, and the characteristics of high resistance, low gamma and low wave moveout in the electric measurement curve, the boundary position is accurately divided. By studying the sequence stratigraphy of the third member of the clear water sag, the third member of the formation is divided into a second-order sequence, three third-order sequences and six fourth-order sequences, and the electrical and lithologic characteristics of the study member in the block are summarized. The seismic profile of the secondary sequence bottom interface of the third member of the Shahejie formation has good continuity, superfluous and local truncation, abrupt lithology and color change, and the top interface of the second order sequence shows a strong amplitude and good continuity in the seismic reflection cophase axis on the seismic profile. Above the interface is obviously superimposed, and below the interface is parallel contact. The Es31 member is divided into two fourth order sequence es 32 member and three four grade sequence es 33 and one four grade sequence. On this basis, the core data of key coring wells in the study area are observed, combining the characteristics of rock facies in the core, sedimentary structural types, mudstone characteristics, vertical rock facies combination, etc. The main subfacies in this area are the subfacies of the sublacustrine fan, based on which the logging facies model is established. Based on the analysis of the plane sedimentary facies in the target formation, the distribution of the planar facies belt of the upper part of Es31 and the upper part of Es31 of Es32 in the lower part of Es32 is completed. Finally, the favorable reservoir is predicted by seismic section, and favorable reservoir is selected, which provides geological basis for oil and gas exploration in this area.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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