塔里木盆地乌什凹陷石油地质特征
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摘要
对乌什凹陷重 磁非地震资料和新老地震剖面的地层及构造特征进行了解释 ,确定了乌什凹陷的盆地结构和断裂构造格架 ,分析了中生界的地层分布特征 ,对乌什凹陷的构造区带进行了重新划分。结果表明 ,乌什凹陷构造样式在东、西向有一定差异 ,可分西、中、东 3个次级凹陷以及西、东 2个低梁带 ,中生界主要分布在乌什凹陷东部。对乌参 1井及邻区沉积储层研究表明 ,乌什凹陷白垩系扇三角洲相砂砾岩物源来自温宿凸起 ,与北部和东部沉积体系有较大差别。凹陷内白垩系砂岩储层发育 ,总厚度约为2 0 0～ 3 0 0m ,纵向上储层非均质性较强。在阿瓦特河剖面的侏罗系恰克马克组新发现了一套更好的湖相灰黑色泥质泥晶云岩源岩。烃源岩评价结果表明 ,侏罗系恰克马克组母质类型好 ,成熟度适中 ,生油潜力巨大 ;西部石炭 二叠系海相源岩的热演化程度高 ,有机质丰度低 ,综合评价其生油潜力相对较差。乌参 1井油气源对比和成藏研究表明 ,其油气不同源 ,天然气来自侏罗系陆相腐殖型源岩 ;原油来自侏罗系恰克马克组湖相腐泥型母质。乌参 1井为常温超高压层状富含油凝析气藏 ,其成藏机制为 :异常压力封存箱内 ,侧向运移供气 ,沿断裂或不整合面充注 ,择优富集 ,晚期成藏。综合研究结果表明 ,乌什凹陷东部低梁及其南翼陡断阶带是?
The integrated explanations of gravity-magnetic data and the characters of seismic sections of Wushi Sag were carried out. The basin filling sequence, structure framework and fault system were determined. The characters of Mesozoic stratigraphic distribution and structural play of Wushi Sag were analyzed. It shows that the structure pattern of Wushi Sag is different from west to east. Wushi Sag can be divided into western,central and eastern sub-sags as well as western and eastern low rise beam belts. The Mesozoic stratigraphy is chiefly distributed in the east Wushi Sag. The geology characters of Well Wucan-1 and adjacent sedimentary reservoir show that the provenance of Cretaceous fan-delta sandstones and conglomerates of Well Wucan-1 is Wen-Su Bulge. The depositional systems of Well Wucan-1 are very different from those of northern and eastern areas. The total thickness of the Cretaceous sandstone reservoir developed in Wushi Sag is approximately from 200 to 300 meters. The heterogeneity of reservoir in vertical sense is relatively strong. A new better source rock of gray dark politic micrite dolomite was found in the Jurassic Qiakemake Formation of Awate river profile. The source rock of the Jurassic Qiakemake Formation has good parent materials,moderate maturity and great oil-bearing potential. The western source rock of the Permo*$-Carboniferous marine facies has poor oil-bearing potential,because of their lower abundance of organic matters and higher degree of thermal evolution of Well Wucan-1.Gas was originated from the Jurassic humic type source rock of continental facies,and oil came from the Jurassic Qiakemake Formation sapropelic type source rock of lacustrine facies. Well Wucan-1 belongs to the rich condensate gas pool with normal temperature,super-pressure and bedded style. The pool-forming mechanism of Well Wucan-1 was characterized by abnormal pressure compartment,feed from lateral hydrocarbon kitchen,charged along fault or unconformity surface,accumulation in high-quality reservoir,pool-forming in late stage. The eastern low bulge belt and the southern belt of Wushi Sag are the most favorable areas for oil and gas accumulation. The pool-forming condition in these areas is similar to the Quele area of Kuqa Basin.
The integrated explanations of gravity-magnetic data and the characters of seismic sections of Wushi Sag were carried out. The basin filling sequence, structure framework and fault system were determined. The characters of Mesozoic stratigraphic distribution and structural play of Wushi Sag were analyzed. It shows that the structure pattern of Wushi Sag is different from west to east. Wushi Sag can be divided into western,central and eastern sub-sags as well as western and eastern low rise beam belts. The Mesozoic stratigraphy is chiefly distributed in the east Wushi Sag. The geology characters of Well Wucan-1 and adjacent sedimentary reservoir show that the provenance of Cretaceous fan-delta sandstones and conglomerates of Well Wucan-1 is Wen-Su Bulge. The depositional systems of Well Wucan-1 are very different from those of northern and eastern areas. The total thickness of the Cretaceous sandstone reservoir developed in Wushi Sag is approximately from 200 to 300 meters. The heterogeneity of reservoir in vertical sense is relatively strong. A new better source rock of gray dark politic micrite dolomite was found in the Jurassic Qiakemake Formation of Awate river profile. The source rock of the Jurassic Qiakemake Formation has good parent materials,moderate maturity and great oil-bearing potential. The western source rock of the Permo*$-Carboniferous marine facies has poor oil-bearing potential,because of their lower abundance of organic matters and higher degree of thermal evolution of Well Wucan-1.Gas was originated from the Jurassic humic type source rock of continental facies,and oil came from the Jurassic Qiakemake Formation sapropelic type source rock of lacustrine facies. Well Wucan-1 belongs to the rich condensate gas pool with normal temperature,super-pressure and bedded style. The pool-forming mechanism of Well Wucan-1 was characterized by abnormal pressure compartment,feed from lateral hydrocarbon kitchen,charged along fault or unconformity surface,accumulation in high-quality reservoir,pool-forming in late stage. The eastern low bulge belt and the southern belt of Wushi Sag are the most favorable areas for oil and gas accumulation. The pool-forming condition in these areas is similar to the Quele area of Kuqa Basin.
引文
王招明,李曰俊,周黎霞,等.塔里木盆地第十三区块圈闭评价与目标选择研究报告(内部报告).塔里木油田分公司,1999.
贾进华,范土芝,周兴熙,等.库车坳陷白垩系储层评价、重点油气成藏系统及乌什凹陷地震层位对比(内部报告).中国石油勘探开发研究院,2001.
[1] 王宝瑜,朗智军,李向东,等.中国天山西段地质剖面综合研究[M ].北京:科学出版社,1994:1971.
[2] 刘本培,王自强,张传恒,等.西南天山构造格局与演化[M ].北京:中国地质大学出版社,1996:105110.
[3] 贾润胥,翟晓先,周永昌,等.塔里木盆地东北地区地质构造基本特征[A].见:中国塔里木盆地北部油气地质研究(第一辑)[C].北京:中国地质大学出版社,1999:928.
[4] 王根长,刘朝安,熊剑飞.新疆塔东北地区石炭、二叠纪沉积相[A].见:中国塔里木盆地北部油气地质研究(第一辑)[C].北京:中国地质大学出版社,1999:160168.
[5] 王招明,夏维书,周黎霞,等.塔里木盆地乌什凹陷及周边露头区油气地质[M ].北京:石油工业出版社.2002:1128.
[6] 贾承造.塔里木盆地及周边地层研究[M ].北京:科学出版社,2004:263369.
[7] 贾进华.库车前陆盆地白垩纪巴什基奇克组沉积层序与储层研究[J].地学前缘,2000,7(3):133143.
[8] 贾进华,顾家裕.克拉2气田优质砂岩储层控制因素与孔隙演化[J].科学通报,2002,47(增刊):97102.
[9] 赵孟军,张永昌.塔里木盆地天然气成因类型及成藏条件[J].中国石油勘探,2001,6(2):2731.
[10] RadkeM ,WelteDH ,WillschH .GeochemicalstudyonawellintheWestenCanadaBasin:relationofthearomaticdistribution patterntomaturityoforganicmatter[J].Geochim.Cosmochim.Acta,1982,46,110.
[11] 赵孟军,卢双舫.库车坳陷两期成藏及其对油气分布的影响[J].石油学报,2003,24(5):1625.
[12] 赵靖舟,戴金星.库车前陆逆冲带天然气成藏期与成藏史[J].石油学报,2002,23(2):611.
贾进华,范土芝,周兴熙,等.库车坳陷白垩系储层评价、重点油气成藏系统及乌什凹陷地震层位对比(内部报告).中国石油勘探开发研究院,2001.
[1] 王宝瑜,朗智军,李向东,等.中国天山西段地质剖面综合研究[M ].北京:科学出版社,1994:1971.
[2] 刘本培,王自强,张传恒,等.西南天山构造格局与演化[M ].北京:中国地质大学出版社,1996:105110.
[3] 贾润胥,翟晓先,周永昌,等.塔里木盆地东北地区地质构造基本特征[A].见:中国塔里木盆地北部油气地质研究(第一辑)[C].北京:中国地质大学出版社,1999:928.
[4] 王根长,刘朝安,熊剑飞.新疆塔东北地区石炭、二叠纪沉积相[A].见:中国塔里木盆地北部油气地质研究(第一辑)[C].北京:中国地质大学出版社,1999:160168.
[5] 王招明,夏维书,周黎霞,等.塔里木盆地乌什凹陷及周边露头区油气地质[M ].北京:石油工业出版社.2002:1128.
[6] 贾承造.塔里木盆地及周边地层研究[M ].北京:科学出版社,2004:263369.
[7] 贾进华.库车前陆盆地白垩纪巴什基奇克组沉积层序与储层研究[J].地学前缘,2000,7(3):133143.
[8] 贾进华,顾家裕.克拉2气田优质砂岩储层控制因素与孔隙演化[J].科学通报,2002,47(增刊):97102.
[9] 赵孟军,张永昌.塔里木盆地天然气成因类型及成藏条件[J].中国石油勘探,2001,6(2):2731.
[10] RadkeM ,WelteDH ,WillschH .GeochemicalstudyonawellintheWestenCanadaBasin:relationofthearomaticdistribution patterntomaturityoforganicmatter[J].Geochim.Cosmochim.Acta,1982,46,110.
[11] 赵孟军,卢双舫.库车坳陷两期成藏及其对油气分布的影响[J].石油学报,2003,24(5):1625.
[12] 赵靖舟,戴金星.库车前陆逆冲带天然气成藏期与成藏史[J].石油学报,2002,23(2):611.
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