博孜9井的发现与塔里木盆地超深层天然气勘探潜力  

Discovery of Well Bozi 9 and ultra-deep natural gas exploration potential in the Kelasu tectonic zone of the Tarim Basin

作　　者：田军[1] 杨海军[2] 吴超[2] 莫涛[2] 朱文慧[2] 史玲玲[2] TIAN Jun;YANG Haijun;WU Chao;MO Tao;ZHU Wenhui;SHI Lingling(PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;Exploration and Development Research Institute,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油塔里木油田公司 [2]中国石油塔里木油田公司勘探开发研究院

出　　处：《天然气工业》2020年第1期11-19,共9页Natural Gas Industry

基　　金：国家科技重大专项“塔里木前陆盆地油气成藏、关键勘探技术与新领域目标优选”（编号：2016ZX05003-004）;中国石油天然气股份有限公司重大科技专项“库车前陆盆地油气地质认识深化研究与目标落实”（编号：2018E-1801）

摘　　要：塔里木盆地克拉苏构造带西部的博孜—大北区段为超深、高温、超高压、构造变形强的复杂构造区,油气勘探程度低,近期部署在该区段的一口油气预探井——博孜9井取得了突破,压裂测试获得了高产工业油气流。为了加快该区的油气勘探进程,分析了克拉苏构造带断裂分级组合、古构造对构造变形的控制作用,研究了下白垩统巴什基奇克组和巴西改组储层的物源、应力场及油气成藏特征,并评价了其天然气勘探潜力。研究结果表明:①该构造带发育博孜—克拉、克拉苏、克深、拜城等4条一级断裂,形成并控制了4个断裂构造带;②该构造带西部发育博孜、大北2个早白垩世开始发育的古构造,形成了5种构造模式;③该构造带发育巴什基奇克组和巴西改组两套砂岩储层,巴什基奇克组储层属于7500 m超深层优质储层,受粗岩性、弱压实、低应力等3个因素的控制,巴西改组有利储层主要位于第二段,属于辫状河三角洲前缘亚相沉积的裂缝—孔隙型储层;④该构造带西部的原油来源于中侏罗统恰克马克组烃源岩,经历了“早期聚油、晚期聚气”两期成藏,东部干气主要来自上三叠统黄山街组烃源岩,为一期成藏,并形成东部干气、西部凝析气的成藏特征。结论认为,博孜—大北区段发育超过万亿立方米天然气资源的有利圈闭,目前已发现博孜9等一大批千亿立方米级气藏并持续取得油气勘探突破,博孜—大北万亿立方米大气区即将落实。The Bozi–Dabei Block in the west of the Kelasu tectonic zone in the Tarim Basin is a complex tectonic zone which is characterized by ultra depth,high temperature,ultra high pressure,violent structural deformation and low oil and gas exploration degree.In Well Bozi 9 which is a wildcat well drilled in the Bozi–Dabei Block,a breakthrough has been made recently with a high-yield industrial oil and gas flow produced during a fracturing test.In order to speed up the oil and gas exploration in this block,this paper analyzed the controlling effect of fault grading combination and paleo-structure on structural deformation in the Kelasu tectonic zone.Then,provenance,stress field and hydrocarbon accumulation characteristics of Bashijiqike Formation and Baxigai Formation of Lower Cretaceous were investigated.Finally,the natural gas exploration potential was evaluated.And the following research results were obtained.First,there are four first-order faults in the Kelasu tectonic zone,including Bozi-Kela,Kelasu,Keshen and Baicheng,which form and control four fault tectonic belts.Second,in the west of this tectonic zone develop two paleo-structures(Bozi and Dabei),which began in the Early Cretaceous and five structural models are formed.Third,two sets of sandstone reservoirs of Bashijiqike Formation and Baxigai Formation are developed in the Kelasu tectonic zone.The former is an ultra-deep(7500 m)quality reservoir,which is under the control of coarse lithology,weak compaction and low stress.The latter is mainly located in the second member and classified as a fractured–porous reservoir of braided river delta front.Fourth,the crude oil in the west of the Kelasu tectonic zone is originated from the source rocks of the Qiakemake Formation of Middle Jurassic,and it underwent two stages of hydrocarbon accumulation,i.e.,"oil accumulation in the early stage of and gas accumulation in the late stage".The dry gas in the east is mainly derived from the source rocks of the Huangshanjie Formation of Upper Triassic in the pattern of o

关 键 词：塔里木盆地 克拉苏构造带 博孜—大北区段 早白垩世 超深层 圈闭 储集层 天然气成藏 勘探发现 

分 类 号：P618.13[天文地球—矿床学]