四川盆地高石梯——磨溪地区震旦系灯影组碳酸盐岩储层特征  

Characteristics of carbonate reservoirs in Sinian Dengying Formation,Gaoshiti-Moxi area,Sichuan Basin

作　　者：范翔宇 闫雨轩 张千贵 吉人 柏爱川 赵鹏斐 何亮 FAN Xiangyu;YAN Yuxuan;ZHANG Qiangui;JI Ren;BAI Aichuan;ZHAO Pengfei;HE Liang(School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Southwest Company,China National Logging Corporation,Chongqing 401120,China;Logging Technology Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710076,China)

机构地区：[1]西南石油大学地球科学与技术学院 [2]西南石油大学油气藏地质与开发工程国家重点实验室 [3]西南石油大学石油与天然气工程学院 [4]中国石油集团测井有限公司西南分公司 [5]中国石油集团测井有限公司测井技术研究院

出　　处：《天然气勘探与开发》2023年第2期1-11,共11页Natural Gas Exploration and Development

基　　金：国家自然科学基金项目(42172313、51774246);四川省自然科学基金项目(2022NSFSC0185)。

摘　　要：四川盆地高石梯—磨溪地区震旦系灯影组碳酸盐岩气藏储量丰富,属于超深层气藏,孔隙结构复杂且溶洞发育,当前尚未完全厘清该地区灯影组碳酸盐岩储层特征,为油气勘探开发带来极大挑战。本文结合岩石物理性质实验和测井解释研究高石梯—磨溪地区灯影组碳酸盐岩的岩性、测井响应和孔隙性等储层特征。研究结果表明:(1)高石梯—磨溪地区灯影组碳酸盐岩岩性主要为细晶白云岩、藻云岩和泥晶白云岩,其中灯四段细晶白云岩占比61.2%,灯二段藻云岩占比74.3%;(2)灯影组储层空间类型以裂缝和溶蚀孔洞为主,岩石吼道半径较小,中值吼道半径为0.010~0.051μm,平均0.028μm;(3)储层物性灯二段较灯四段好,孔隙度渗透率相关性极差,呈特低孔低渗特征,渗透性受裂缝影响较大;(4)渗透率参差系数计算结果均大于0.9,表明灯影组储层为显著的非均质储层。本研究成果可为该工区优质储层预测、开发设计及钻采工程施工等提供基础依据。Ultra-deep carbonate reservoirs in the Sinian Dengying Formation of the Gaoshiti-Moxi area in Sichuan Basin are rich in gas resource,with complex pore structures and developed karst caves.The reservoir characteristics have not been fully clarified,posing great challenges to hydrocarbon exploration and development of this area.In this paper,the lithology,log response,and pore structure of the reservoirs were studied based on petrophysical experiments and log interpretation.The results are achieved as follows:(i)The carbonate rocks are mainly composed of aplite dolomites,algal dolomites,and dolomicrites.In the fourth member of Dengying Formation(Deng 4 Member),aplite dolomites account for 61.2%;in the second member of Dengying Formation(Deng 2 Member),algal dolomites account for 74.3%.(ii)The reservoir space of the Formation is dominated by fractures and karst vugs.The throat radius is small,with the median value of 0.010–0.051μm and average value of 0.028μm.(iii)The Deng 2 Member exhibits better reservoir properties than the Deng 4 Member.With extremely poor correlation between porosity and permeability,the reservoirs show the characteristics of ultra-low porosity and permeability,and the permeability is greatly affected by fractures.(iv)The calculated permeability diversity coefficients are greater than 0.9,indicating that the reservoirs are significantly heterogeneous.This study can provide a basis for high-quality reservoir predicting,development design,and drilling and production engineering operation for this area.

关 键 词：储层特征 高石梯—磨溪地区 灯影组 储层物性 碳酸盐岩 孔隙特征 物性实验 测井解释 

分 类 号：P618.13[天文地球—矿床学]