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151.
The application of elastic impedance inversion in reservoir prediction at the Jinan area of Tarim Oilfield 总被引:1,自引:0,他引:1
The Triassic reservoir in the Jinan area of Tarim Oilfield consists largely of interbedded sand and shale. Because of the large overlap between sandstone and shale impedance, it is difficult to distinguish sandstone from shale by acoustic impedance alone. Compared to acoustic impedance, elastic impedance contains more lithologic and physical information of the reservoir. Based on meticulous well-tie calibration, elastic impedance data volumes for 10°, 20°, and 30° emergence angles are obtained using pre-stack elastic impedance inversion. A non-linear statistical relationship between elastic impedance and shale content is set up by a PNN neural network. The non-linear mapping relationship is used to predict the reservoir shale content from elastic impedance, which will depict and predict the reservoir oil-bearing sands. 相似文献
152.
重力球面外部校正技术 总被引:1,自引:0,他引:1
山区重力勘探中,重力外部校正是重力勘探料处理和解释的前提,其内容包括地形校正、中间层校正等。本文在分析常规外部校正方法的基础上,提出了一套适合于山区重力勘探的球面地形校正及有限球壳中间层校正方法,并严格推出了球面地形校正公式。对中国南方ZJJ地区重力资料处理结果表明,该方法提高了地形校正的精度,使山区重力资料品质达到或接近平原区的水平。 相似文献
153.
塔里木盆地古生代构造格架与沉积特征 总被引:25,自引:3,他引:25
本文以板块构造理论为主线,应用最新的物探成果和钻井资料,分析了前古生代塔里木盆地地球动力学背景和寒武-奥陶纪、志留-泥盆纪、石炭-二叠纪板块构造演化所形成的盆内隆坳构造格架与沉积特征,认为古生代克拉通原型盆地的发育、各时期的沉积相带分布与沉积建造以及下古生界东厚西薄、上古生界东薄西厚的厚度特征,都是不同地质时代构造演化控制的结果。 相似文献
154.
中国中西部地区以塔里木盆地及其演化为典型代表。震旦纪以来,经历了地台发育、持续沉降、拉张翘倾、挤压坳陷及断陷推覆等构造发育阶段,与中国东部一样,表现为拉张与挤压交互出现的手风琴式演化史,突出的差别在于晚喜马拉雅期在西部地区形成强烈的挤压逆掩推覆构造,而东部地区只形成坳陷式的沉积盆地。中亚—蒙古大洋、秦—祁—昆大洋、古特提斯洋、中特提斯洋、印度洋以及印度板块等在不同地质时期的板块活动是中国中西部地区盆地演化发展的动力学因素。根据地震剖面解释成果,可确定出四种断块油气藏类型,均反映后期挤压逆冲特征,尤其是燕山期—喜马拉雅期推覆前锋带断块油气藏,还可区分为拆离型、褶皱型、前冲型和反冲型等四种,且每一种还可再区分出若干种。 相似文献
155.
156.
The Jiaolai Basin (Fig. 1) is an under-explored rift basin that has produced minor oil from Lower Cretaceous lacustrine deltaic sandstones. The reservoir quality is highly heterogeneous and is an important exploratory unknown in the basin. This study investigates how reservoir porosity and permeability vary with diagenetic minerals and burial history, particularly the effects of fracturing on the diagenesis and reservoir deliverability. The Laiyang sandstones are tight reservoirs with low porosity and permeability (Φ < 10% and K < 1 mD). Spatial variations in detrital supply and burial history significantly affected the diagenetic alterations during burial. In the western Laiyang Sag, the rocks are primarily feldspathic litharenites that underwent progressive burial, and thus, the primary porosity was partially to completely eliminated as a result of significant mechanical compaction of ductile grains. In contrast, in the eastern Laiyang Sag, the rocks are lithic arkoses that were uplifted to the surface and extensively eroded, which resulted in less porosity reduction by compaction. The tectonic uplift could promote leaching by meteoric water and the dissolution of remaining feldspars and calcite cement. Relatively high-quality reservoirs are preferentially developed in distributary channel and mouth-bar sandstones with chlorite rims on detrital quartz grains, which are also the locations of aqueous fluid flow that produced secondary porosity. The fold-related fractures are primarily developed in the silt–sandstones of Longwangzhuang and Shuinan members in the eastern Laiyang Sag. Quartz is the most prevalent fracture filling mineral in the Laiyang sandstones, and most of the small-aperture fractures are completely sealed, whereas the large-aperture fractures in a given set may be only partially sealed. The greatest fracture density is in the silt–sandstones containing more brittle minerals such as calcite and quartz cement. The wide apertures are crucial to preservation of the fracture porosity, and the great variation in the distribution of fracture-filling cements presents an opportunity for targeting fractures that contribute to fluid flow. 相似文献
157.
巴颜喀拉沉积盆地基底为扬子地台西缘的一部分:来自花岗岩的证据 总被引:2,自引:0,他引:2
侵入于巴颜喀拉沉积盆地中的扎加岩体,主要由高钾钙碱性的黑云母花岗岩组成,并出现有具岩浆结构的暗色微粒包体。花岗岩富集轻稀土(LREE)及大离子亲石元素(LILE),相对亏损重稀土(HREE)和高场强元素(HFSE),具Eu负异常(0.5~0.7)、较低的εNd(t)值(-3.5~-6.2)和中等的(^87Sr/^86Sr)初始比值(0.7088~0.7090),它们的亏损地幔Nd模式年龄tDM在1.1~1.3Ga之间。与寄主花岗岩相比,闪长质暗色微粒包体具有较低的SiO2,更低的Eu负异常(0.2~0.4)和εNd(t)值(-4.7~-6.1),更高的(^87Sr/^86Sr)初始比(0.7084~0.7124),以及稍老的tDM(1.4Ga)。岩石的地球化学资料表明,扎加花岗岩是在碰撞后构造环境下幔源岩浆上涌诱发下地壳岩石部分熔融的产物,其物源可能是苦海杂岩和万宝沟岩群的混合物。巴颜喀拉沉积盆地下面存在中元古代的基底,属于扬子地台西缘的一部分 相似文献
158.
重力数据是所有地下场源产生的重力场的叠加,探测对象经常被淹没在区域背景场之中,因此剩余异常的分离对于重力资料研究至关重要,而近来被引入位场领域的小波算子作为了滤波器和场源分析工具,在这里我们分析研究基于小波分析与谱分析的二维离散小波变换用于提高重力异常的分辨能力,再现出由简单形状场源描述密度不均匀的几何特征.本文先介绍二维多分辨率分析小波的基本理论及其提升算法,利用对数功率谱估计平均深度方法理论,接着对理论模型数据进行多尺度异常分解,估计地质体的形状、大小和深度,最后又对实测重力数据进行分析,并与传统常规方法进行比较分析,结果表明对于实际数据分析其方法也是具有可行性的. 相似文献
159.
3D Modeling and Born approximation inversion for the borehole surface electromagnetic method 总被引:1,自引:0,他引:1
We present a 3D approach to numerical modeling of the borehole-surface electromagnetic (BSEM) method. The 3D electromagnetic response created by a vertical line current source in a layered medium is modeled using the 3D integral equation method. The modeling results are consistent with analytical solutions. 3D Born approximation inversion of BSEM data is also conducted for reservoir delineation. The inversion method is verified by a synthetic reservoir model. 相似文献
160.