川中高石梯—磨溪地区灯四段古地貌恢复及其对储层的控制作用

doi:10.3969/j.issn.1672-7703.2019.06.005

摘要/Abstract

摘要： 高石梯—磨溪地区在灯影组沉积后总体都处于有利的岩溶地貌区域，由于构造运动复杂，研究区差异剥蚀明显，导致传统的古地貌恢复技术无法有效指示有利储层。在总结残厚法、印模法等传统古地貌恢复技术的优缺点及适用性的基础上，以高石梯—磨溪地区灯四段岩溶储层为例，提出了一种新的印模法+ 残厚法的沉积古地貌恢复技术，得到了新的沉积古地貌图，并通过对沉积古地貌的综合分析，划分了该地区灯四段有利储集相带。研究结果表明，基于新的沉积古地貌恢复方法得到的沉积古地貌图，能在一定程度上消除剥蚀量带来的地层厚度变化，从而更真实地表征原始沉积地层的厚度；灯三段底界面上的超覆点及残厚法恢复的灯二段古地貌证明了MX47 井区在灯四段开始沉积时处于水体较深的部位，导致其储集性能较差、测试产量较低。最有利的储层发育相带为研究区西侧呈条带状展布的台缘丘滩相；研究区东侧发育局限台地相沉积，储集性能最差。

关键词: 古地貌, 有利储层, 高磨地区, 灯影组

Abstract: The Gaoshiti-Moxi area has been a favorable karst landform after the deposition of the Dengying Formation. However, influenced by complex tectonic movement and obvious differential erosion in the study area, it is unable to effectively indicate favorable reservoirs using traditional paleogeomorphology restoration technologies. On the basis of summarizing the advantages and disadvantages and applicability of traditional paleogeomorphology restoration technologies such as the residual thickness method and the impression method, new paleogeomorphology restoration technology, the impression method + residual thickness method, is proposed by taking the Deng 4 karst reservoir as a case. After mapping a new sedimentary paleogeomorphology, and comprehensively analyzing the sedimentary paleogeomorphology, favorable reservoir facies belts are divided in the Deng 4 Member. The results show that the sedimentary paleogeomorphology map obtained from the new method can eliminate the thickness variation caused by denudation to a certain extent, so original sedimentary thickness could be characterized more realistically. The overlaps on the bottom of the Deng 3 Member and the paleogeomorphology of the Deng 2 Member restored by the residual thickness method proved that, in Well MX47, the Deng 4 Member was in deep water when it began to deposit, resulting in poor reservoir physical properties and low tested production. The most favorable reservoir facies belt is the stripped shoal facies on the platform margin in the western part of the study area. In the eastern part of the study area, there are restricted platform facies where the reservoir properties are the worst.

中图分类号:

朱正平, 罗文军, 潘仁芳, 翁雪波, 金吉能. 川中高石梯—磨溪地区灯四段古地貌恢复及其对储层的控制作用[J]. 中国石油勘探, 2019, 24(6): 730-738.

Zhu Zhengping, Luo Wenjun, Pan Renfang, Weng Xuebo, Jin Jineng. The paleogeomorphology restoration of the Sinian Deng 4 Member and its control on reservoir formation in the Gao-Mo area in the central Sichuan Basin[J]. China Petroleum Exploration, 2019, 24(6): 730-738.

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