表腹双复杂构造区深层砂岩有效储层定量预测——以塔里木盆地中秋里塔格地区巴什基奇克组为例  

Quantitative prediction of deep effective sandstone reservoir in geomorphologic and tectonic complicated area:An example from Bashenjiqike Formation of Middle Qiulitage Area in Tarim Basin

作　　者：徐兆辉[1] 徐振平[2] 张荣虎 王露[1] 胡再元[4] 秦连彬 XU Zhaohui;XU Zhenping;ZHANG Ronghu;WANG Lu;HU Zaiyuan;QIN Lianbin(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China;Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China;PetroChina Hangzhou Research Institute of Geology,Hangzhou,Zhejiang 310023,China;Northwest Branch,Research Institute of Petroleum Exploration&Development,Lanzhou,Pe-troChina,Gansu 730020,China;Xinjiang Tadong Oil and Gas Exploration and Development Co.,Ltd,Daqing Oilfield Company,PetroChina,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田公司,新疆库尔勒841000 [3]中国石油杭州地质研究院,浙江杭州310023 [4]中国石油勘探开发研究院西北分院,甘肃兰州730020 [5]大庆油田新疆塔东油气勘探开发有限责任公司,新疆库尔勒841000

出　　处：《石油地球物理勘探》2022年第1期194-205,I0008,I0009,共14页Oil Geophysical Prospecting

基　　金：中美国际合作项目“海相碳酸盐岩地震沉积学综合研究技术及其在塔里木盆地的应用”(19HTY5000008);国家重点研发计划项目“盐下超深层碎屑岩规模储层成因与油气成藏机理”(2019YFC0605501);中石油项目“库车坳陷秋里塔格构造带石油地质特征与区带目标评价”(041019120071)联合资助。

摘　　要：中秋里塔格地区地表高陡“刀片山”地貌导致地震资料采集、处理难度大;地腹前陆冲断带构造样式复杂导致地震成像效果差、地震资料信噪比低。上述“双复杂”情况导致地震资料解释多解性强、储层预测干扰因素多。为此,基于新处理的叠后深度域三维地震和钻/测井资料,应用地震沉积学方法,分断盘定性恢复岩相分布与演化,利用主因子分析技术将地震属性转换为主因子,经过与井点实测有效储层(孔隙度>6%)累计厚度拟合,计算得到目的层段有效储层厚度,并探讨了有效储层分布的主控因素。得到以下认识:①目的层段以中厚层砂岩为主,在融合剖面上表现为低频,少量薄砂岩或泥岩则表现为高频。②在砂岩大面积展布背景上,有效储层横向分布具有非均质特征,其中上盘连续性好、厚度大(50~65m);中盘连续性差,局部厚达75m,最薄仅45m;下盘有效储层连续性中等,厚度偏小(50~60m)。③岩相是控制有效储层横向连续性和厚度的主要因素,北东—南西向断裂也对有效储层分布起调节作用。笔者将地震沉积学应用范围从构造简单区的中浅层扩展至表腹“双复杂”区的深层,扩大了应用领域,为具有类似背景地区有效储层预测提供了借鉴。The high and steep"blade mountain"topography in the Middle Qiulitage Area makes it difficult to acquire and process seismic data.The complex subsurface structure of the foreland thrust belt leads to poor seismic imaging and low signal-to-noise ratios.The above-mentioned"dual complexity"situation has caused a strong ambiguity in seismic interpretation and many interference factors in the prediction of sedimentary reservoirs.To this end,on the basis of the newly processed post-stack depth-domain 3D seismic and drilling/logging data,we use seismic sedimentology to qualitatively restore the distribution and evolution of lithofacies in three fault walls,respectively.The principal component analysis is utilized to convert seismic attributes into principal components.Through the fitting of the accumulated thickness of the effective reservoir(porosity>6%)measured at well points,the effective reservoir thickness of the target interval is calculated.Then main controlling factors of effective reservoir distribution are discussed.The following conclusions were obtained:①The target interval is dominated by medium-thick sandstone,showing low frequency on the blended profile and high frequency in a small amount of thin sandstone or mudstone.②On the large-area distribution of sandstone,the lateral distribution of effective reservoirs is heterogeneous,in which the hanging wall has good continuity and large thickness(50~65m);the middle wall has poor continuity with thickness of 45~75m;the effective reservoir of the foot wall has medium continuity and small thickness(50~60m).③Lithofacies is the main factor that controls the lateral continuity and thickness of effective reservoirs,and the northeast-southwest trending faults also regulate the distribution of effective reservoirs.In this paper,the application scope of seismic sedimentology is extended from the shallow layers in areas with simple structures to deep layers in the"dual complexity",namely surface and subsurface areas.The paper also provides a reference for effective

关 键 词：塔里木盆地 中秋里塔格地区 巴什基奇克组 主因子分析 定量预测 地震沉积学 

分 类 号：P631[天文地球—地质矿产勘探]