西秋构造带盐下构造圈闭及其天然气成藏条件
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摘要
传统的观点认为库车前陆盆地西秋构造带盐下为大单斜背景下的低隆起,构造带中部不存在较大幅度的隆升。而通过对该区钻井、地震、重力、电法等多种资料的分析研究,认为该区存在大型盐下背斜构造:①盐下连续性很强的地震反射波组解释为以砂泥岩为主的岩层更合理;②新的构造解释模型与邻区克拉苏和东秋—迪那构造带相似;③重力、电法资料均显示西秋构造带核部存在盐下中生界隆升,证实存在盐下大型构造。该盐下构造规模较大,构造圈闭比较完整,邻区的钻井显示古近系和白垩系发育优质砂岩储层,古近系膏盐的封盖条件好,油气聚集和保存条件优越,有望形成大型整装气田。建议加大对该区的油气勘探力度,开展地震资料处理,在中戈壁区部署高密度宽线地震联络测线,落实盐下构造圈闭,并进行风险勘探目标的论证工作。
It is commonly accepted that the subsalt structure in the western Qiulitage,Kuqa foreland basin,is a low uplift developed in a large monocline setting and no large-amplitude uplifting occurred in the center of this structural belt.However,an integrated analysis of the drilling,seismic,gravity,and electric survey data of the study area reveals the existence of a large subsalt anticline.①It is more rational to interpret subsalt reflected wave groups with very strong continuity as strata dominated by sandstone and mudstone.②The new structural interpretation model is similar to that of the adjacent Kelasu and eastern Qiulitage-Dina structural zone.③Both gravity and electric survey data reveal that a subsalt Mesozoic uplift exists in the core of the western Qiulitage structural zone,verifying the existence of a large subsalt structure.The subsalt structure is large in scale and good in trap integrity.The drilling data of the adjacent area show that sandstone reservoirs of high quality occur in the Paleogene and Cretaceous.The sealing capacity of the Paleogene salt is large.The favorable conditions for hydrocarbon accumulation and preservation reveal the possibility of discovering a large uncompartmentalized gas field.It is proposed to strengthen exploration,process available seismic data,acquire high-density broadened cross lines in the central gobi area,delineate subsalt structural traps,and select the target of risk exploration.
It is commonly accepted that the subsalt structure in the western Qiulitage,Kuqa foreland basin,is a low uplift developed in a large monocline setting and no large-amplitude uplifting occurred in the center of this structural belt.However,an integrated analysis of the drilling,seismic,gravity,and electric survey data of the study area reveals the existence of a large subsalt anticline.①It is more rational to interpret subsalt reflected wave groups with very strong continuity as strata dominated by sandstone and mudstone.②The new structural interpretation model is similar to that of the adjacent Kelasu and eastern Qiulitage-Dina structural zone.③Both gravity and electric survey data reveal that a subsalt Mesozoic uplift exists in the core of the western Qiulitage structural zone,verifying the existence of a large subsalt structure.The subsalt structure is large in scale and good in trap integrity.The drilling data of the adjacent area show that sandstone reservoirs of high quality occur in the Paleogene and Cretaceous.The sealing capacity of the Paleogene salt is large.The favorable conditions for hydrocarbon accumulation and preservation reveal the possibility of discovering a large uncompartmentalized gas field.It is proposed to strengthen exploration,process available seismic data,acquire high-density broadened cross lines in the central gobi area,delineate subsalt structural traps,and select the target of risk exploration.
引文
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[2]赵文智,许大丰,张朝军,等.库车凹陷构造变形层序划分及在油气勘探中的意义[J].石油学报,1998,19(3):1-5.
[3]汤良杰,贾承造,金之钧,等.塔里木盆地库车前陆褶皱带中段盐相关构造特征与油气聚集[J].地质论评,2003,49(5):501-506.
[4]邬光辉,刘玉魁,罗俊成,等.库车坳陷盐构造特征及其对油气成藏的作用[J].地球学报,2003,24(3):249-253.
[5]陈书平,汤良杰,贾承造,等.库车坳陷西段盐构造及其与油气的关系[J].石油学报,2004,25(1):30-34.
[6]管树巍,陈宁华,徐峰,等.库车坳陷秋里塔格褶皱带几何学和运动学特征与油气圈闭[J].石油学报,2003,24(6):30-34.
[7]刘云祥,杨书江.库车坳陷却勒—西秋地区高精度重磁力、CEMP勘探成果报告[R].涿州:中国石油东方地球物理勘探有限公司,2005.
[8]杨书江,李同彬.西秋构造带CEMP勘探成果报告[R].涿州:中国石油东方地球物理勘探有限公司,2007.
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