石油学报 ›› 2023, Vol. 44 ›› Issue (8): 1299-1312,1332.DOI: 10.7623/syxb202308007

• 地质勘探 • 上一篇    下一篇

川中高石梯区块灯影组四段古岩溶带及内部储层分布特征

夏钦禹1, 马新华1, 郭振华1, 李文2, 江林3, 张林1, 李新豫1, 刘曦翔2, 罗瑞兰1, 闫海军1, 刘钰洋1, 阳成4   

  1. 1. 中国石油勘探开发研究院 北京 100083;
    2. 中国石油西南油气田公司勘探开发研究院 四川成都 610051;
    3. 中国石油西南油气田公司蜀南气矿 四川泸州 646000;
    4. 中国石油青海油田公司气田开发处 甘肃敦煌 736202
  • 收稿日期:2022-10-18 修回日期:2023-03-15 出版日期:2023-08-25 发布日期:2023-09-06
  • 通讯作者: 夏钦禹,男,1991年4月生,2013年获长江大学学士学位,2016年获中国石油大学(北京)硕士学位,现为中国石油勘探开发研究院工程师,主要从事油气藏开发地质研究工作。
  • 作者简介:夏钦禹,男,1991年4月生,2013年获长江大学学士学位,2016年获中国石油大学(北京)硕士学位,现为中国石油勘探开发研究院工程师,主要从事油气藏开发地质研究工作。Email:xiaqy-ordos@petrochina.com.cn
  • 基金资助:
    中国石油天然气股份有限公司"十四五"前瞻性基础性科技重大项目(2021DJ15)和中国石油天然气股份有限公司科学研究与技术开发项目(2022KT0905)资助。

Distribution characteristics of paleokarst zones and internal reservoirs in the fourth Member of Dengying Formation in Gaoshiti block, central Sichuan Basin

Xia Qinyu1, Ma Xinhua1, Guo Zhenhua1, Li Wen2, Jiang Lin3, Zhang Lin1, Li Xinyu1, Liu Xixiang2, Luo Ruilan1, Yan Haijun1, Liu Yuyang1, Yang Cheng4   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Research Institute of Exploration & Development, PetroChina Southwest Oil & Gasfield Company, Sichuan Chengdu 610051, China;
    3. Shunan Gasfield, PetroChina Southwest Oil & Gasfield Company, Sichuan Luzhou 646000, China;
    4. Gasfield Development Management Office, PetroChina Qinghai Oilfield Company, Gansu Dunhuang 736202, China
  • Received:2022-10-18 Revised:2023-03-15 Online:2023-08-25 Published:2023-09-06

摘要: 四川盆地震旦系灯影组四段(灯四段)在表生期岩溶作用影响下纵向岩溶分带特征明显,不同岩溶带储层发育程度差异较大,有必要精细刻画古岩溶带内部结构,进一步明确优质储层的分布。综合岩心、地震、成像测井等资料,基于地下水运动方式及孔、洞、缝发育特征,开展了高石梯区块灯四段古岩溶带划分,建立了古岩溶带厚度与古岩溶地貌相对高程的关系,并细分水平潜流亚带,分析不同期水平潜流亚带优质储层的发育特征,分区优选了有利古岩溶亚带。研究表明,高石梯区块灯四段古岩溶地貌越高,垂直渗流带厚度越大、水平潜流带厚度越小。受古岩溶潜水面周期下降影响,水平潜流带内发育3期水平潜流亚带,上部水平潜流亚带1、亚带2优质储层发育程度优于亚带3。根据沉积相、古岩溶地貌及优质储层展布特征,将高石梯区块划分为3个区域。区块西侧(1区)各岩溶带和亚带优质储层均较发育,优质储层累计厚度超50 m,为最有利区域;区块东侧(2区)优质储层仅发育于垂直渗流带,优质储层累计厚度为15~20 m;区块南侧(3区)优质储层主要发育于垂直渗流带和水平潜流亚带1,优质储层累计厚度为30~40 m。不同区域优质储层发育的岩溶带、亚带存在差异,应采用不同的开发技术政策。

关键词: 四川盆地, 高石梯区块, 震旦系, 灯影组, 古岩溶带, 优质储层

Abstract: Under the effect of epigenic karstification, the fourth member of the Sinian Dengying Formation in Sichuan Basin (hereinafter referred to as Deng 4 Member) is obviously characterized with vertical karst zoning, and the development degree of reservoirs in different karst zones varies greatly. Thus, it is necessary to precisely describe the internal structure of paleokarst zone and further clarify the distribution of high-quality reservoirs. Based on the data of core, seismic, and imaging logging, as well as the groundwater movement pattern and development characteristics of pores, vugs and fractures, the paper divides the paleokarst zones of Deng 4 Member in Gaoshiti block, establishes a relationship between the thickness of paleokarst zone and the relative elevation of paleokarst landform, subdivides horizontal underflow subzones, analyzes the development characteristics of high-quality reservoirs in each underflow subzone in different periods, and optimizes favorable paleokarst zones in each zone. Research shows that the higher the paleokarst landforms in Deng 4 Member of Gaoshiti block, the thicker the longitudinal vadose zones and the thinner the horizontal underflow zones. Affected by periodic decline of paleokarst water table, three stages of underflow subzones were developed in the horizontal underflow zone, of which the development degree of high-quality reservoirs in the upper underflow subzones 1 and 2 is better than that in the subzone 3. According to the sedimentary facies, paleokarst landforms and distribution characteristics of high-quality reservoirs, Gaoshiti block was divided into 3 zones. Karst zones and subzones on the west side of the block (Zone 1) has well-developed high-quality reservoirs with a cumulative thickness of over 50 m, as being the most favorable area. The high-quality reservoirs on the east side of the block (Zone 2) are only developed in the longitudinal vadose zone, with a cumulative thickness of 15-20 m. The high-quality reservoirs on the south side of the block (Zone 3) are mainly developed in the longitudinal vadose zone and the horizontal underflow subzone 1, with a cumulative thickness of 30-40 m. In conclusion, there are differences in karst zones and subzones of high-quality reservoirs developed in different areas, so that it is necessary to adopt different development technologies and policies.

Key words: Sichuan Basin, Gaoshiti block, Sinian System, Dengying Formation, paleokarst zone, high-quality reservoir

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