基于数字露头技术的扇三角洲前缘砂体构型特征——以库车坳陷前陆区索罕村剖面为例

发布时间：2018-02-04 16:16

本文关键词： 数字露头技术扇三角洲前缘砂体构型储层模型库车坳陷前陆区　出处：《油气地质与采收率》2017年02期 　论文类型：期刊论文

【摘要】：库车坳陷前陆区白垩系巴什基奇克组广泛发育扇三角洲前缘砂体,是天然气富集的有利场所。针对大北气田钻井少、井距大的特点,选取与目的层地质特征相似的典型露头剖面,利用三维激光扫描技术对其进行多方位全覆盖扫描和三维数据采集,并与人工实测地质信息和分析化验资料相结合,借助计算机模拟技术建立三维数字化地质模型,有效揭示扇三角洲前缘砂体构型特征。结果表明:研究区扇三角洲前缘砂体构型样式包括不完全叠拼式、侧拼式和孤立式3种,由于构型样式不同,砂体间连通性存在差异;砂体具有多期水下分流河道垂向叠加、大面积连续分布的特点,且河道砂体中、下部物性比底部和上部好,且以均质的中砂岩和细砂岩为最优;伴有少量河口坝和远砂坝微相沉积,砂体厚度和宽度与厚度比具有较好的负相关性;砂岩含量高,砂体间发育稳定的条带状泥岩,砂体间并非完全连通,层内和层间非均质性较强。
[Abstract]:Fan delta front sand body is widely developed in the Cretaceous Bashiqike formation of Kuqa depression, which is a favorable place for natural gas enrichment. The typical outcrop profile which is similar to the geological characteristics of the target layer is selected, and the 3D laser scanning technique is used to carry out the multi-azimuth full coverage scanning and the 3D data acquisition. With the combination of artificial measured geological information and analytical and laboratory data, a three-dimensional digital geological model is established by computer simulation technology. The results show that there are three types of sand bodies in the front of fan delta in the study area, which are incomplete stacking, side splicing and isolating, because of the different configuration styles. There are differences in connectivity between sand bodies; Sand body is characterized by vertical superposition and large area continuous distribution of underwater distributary channel. In channel sand body, the physical properties of lower part are better than that of bottom and upper, and homogeneous medium sandstone and fine sandstone are the best. With a small number of estuarine dams and distal sand dams microfacies deposition, sand body thickness and width and thickness ratio has a good negative correlation; The sandstone has high content and stable strip mudstone between sand bodies, which is not completely connected between sand bodies, and has strong heterogeneity within and between layers.
【作者单位】：中国石油勘探开发研究院杭州地质研究院;中国石油东方地球物理公司研究院库尔勒分院;
【基金】：国家科技重大专项“重点前陆冲断带储层改造机制与地质评价”(2016ZX05003-001-002) 国家“973”计划“中国西部叠合盆地深部油气复合成藏机制与富集规律”(2011CB201104)
【分类号】：P618.13
【正文快照】： 野外露头观察与描述是石油地质研究中的一项基础工作,在油气地质勘探和开发过程中起至关重要的作用。随着油气勘探开发进程的深入,亟需建立比油气区井网更加精细的露头地质模型,以指导地下储层模型的建立。早期露头研究以人工观察、测量为主,通过剖面详细解剖建立了一系列针对

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