准噶尔盆地哈山地区隐蔽油气藏识别
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摘要
准噶尔盆地哈山地区发育砂砾岩扇体隐蔽油气藏,而砂砾岩体一般为多期发育、多次沉积的复合体,其内部结构非常复杂,隐蔽圈闭难于识别。文中以哈山地区侏罗系八道湾组下段砂砾岩扇体为例,根据层序地层学原理,通过对单井相层序进行层序界面识别及旋回特征分析,从而实现砂砾岩体沉积期次精细划分,建立了研究区的地层格架。同时,通过对沉积剖面的观察和分析,结合测井、试油等资料,配合区域沉积相研究,在目标区对地层进行对比和小层划分。选取目标砂体,利用沿层属性提取、地震相等多种地球物理技术,准确地识别出哈山地区扇体隐蔽圈闭,并通过钻探试油,喜获工业油流,取得了中国石化在该区勘探的实质性突破,为寻找该区的类似隐蔽性圈闭总结出了一套行之有效的方法。
Coarse-grained clastic fan subtle traps are well developed in the Hassan block of Junggar Basin.However,the coarse-grained clastic deposits are commonly complexes composed of multiple coarse-grained clastic fans deposited at different geological times.As their internal structures are very complicated,the identification of subtle traps is difficult.Taking the coarse-grained clastic fan of the lower Badaowan Formation of the Jurassic in Hassan block as an example,we identified sequence boundaries and analyzed features of sedimentary cycles in single well by using the sequence stratigraphy method,then performed fine division of the deposits stages of coarse-grained clastics,and finally established a stratigraphic framework.Furthermore,sedimentary section,logging and test data,and regional sedimentary facies were integrated to carry out stratigraphic correlation and layer subdivision and select target sandbodies.By using various geophysical techniques such as seismic attribute extraction and seismic facies,we accurately identified the subtle traps in the Hassan block.Commercial oil flow was tested in these subtle traps,marking a big breakthrough of exploration in this block.These methods may be also effective for identification of subtle traps in similar blocks.
Coarse-grained clastic fan subtle traps are well developed in the Hassan block of Junggar Basin.However,the coarse-grained clastic deposits are commonly complexes composed of multiple coarse-grained clastic fans deposited at different geological times.As their internal structures are very complicated,the identification of subtle traps is difficult.Taking the coarse-grained clastic fan of the lower Badaowan Formation of the Jurassic in Hassan block as an example,we identified sequence boundaries and analyzed features of sedimentary cycles in single well by using the sequence stratigraphy method,then performed fine division of the deposits stages of coarse-grained clastics,and finally established a stratigraphic framework.Furthermore,sedimentary section,logging and test data,and regional sedimentary facies were integrated to carry out stratigraphic correlation and layer subdivision and select target sandbodies.By using various geophysical techniques such as seismic attribute extraction and seismic facies,we accurately identified the subtle traps in the Hassan block.Commercial oil flow was tested in these subtle traps,marking a big breakthrough of exploration in this block.These methods may be also effective for identification of subtle traps in similar blocks.
引文
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[2]何登发,尹成,杜社宽,等.前陆冲断带构造分段特征——以准噶尔盆地西北缘断裂构造带为例[J].地学前缘,2004,11(3):91-99.He Dengfa,Yin Cheng,Du Shekuan,et al.Characteristics ofstructural segmentation of foreland thrust belts—a case study ofthe fault belts in the northwestern margin of Junggar Basin[J].Earth Science Frontiers,2004,11(3):91-99.
[3]黄传炎,廖远涛,张青,等.板桥凹陷隐蔽油气藏类型及特征研究[J].石油地质与工程,200620(6):6-9.Huang Chuanyan,Liao Yuantao,Zhang Qing,et al.Research onthe types and characteristics of subtle reservoir formation inBanqiao sag[J].Petroleum Geology and Engineering,2006,20(6):6-9.
[4]陈荣书.关于“隐蔽圈闭(油气藏)”的早期概念[J].石油与天然气质,1984,5(3):300-301.Chen Rongshu.The early concept about“subtle trap(reser-voir)”[J].Oil&Gas Geology,1984,5(3):300-301.
[5]沈守文,彭大钧,颜其彬,等.试论隐蔽油气藏的分类及勘探思路[J].石油学报,2000,(1):16-21.Shen Shouwen,Peng Dajun,Yan Qibin,et al.Classification andexploration methods of subtle trap reservoirs[J].Acta PetroleiSinica,2000,(1):16-21.
[6]朱筱敏,董艳蕾,胡廷惠,等.精细层序地层格架与地震沉积学研究——以泌阳凹陷核桃园组为例[J].石油与天然气地质,2011,32(4):615-624.Zhu Xiaomin,Dong Yanlei,Hu Tinghui,et al.Seismic sedimen-tology study of fine sequence stratigraphic framework:a casestudy of the Hetaoyuan Formation in the Biyang Sag[J].Oil&Gas Geology,2011,32(4):615-624.
[7]姜在兴.沉积体系及层序地层学研究现状及发展趋势[J].石油与天然气地质,2010,31(5):535-541.Jiang Zaixing.Studies of depositional systems and sequencestratigraphy:the present and the future[J].Oil&Gas Geology,2010,31(5):535-541.
[8]王世瑞,彭苏萍,凌云,等.利用地震属性研究准噶尔盆地西北缘拐19井区下侏罗统三工河组沉积相[J].古地理学报,2005,7(2):169-184.Wang Shirui,Peng Suping,Ling Yun,et al.Research on sedi-mentary facies of the Sangonghe Formation of Lower Jurassic byseismic attributes in Well Guai 19 of northwestern margin areain Junggar Basin[J].Journal of Palaeogeography,2005,7(2):169-184.
[9]李云,丁正青,许江桥,等.SWD地区隐蔽圈闭的识别[J].石油地球物理勘探,2005,40(5):579-584.Li Yun,Ding Zhengqing,Xu Jiangqiao,et al.Reognition of sub-tle traps in SWD area.[J].Oil Geophysical Exploration,2005,40(5):579-584.
[10]陆基孟.地震勘探原理[M].山东东营:石油大学出版社,1993.Lu Jimeng.Principles of seismicprospecting[M].ShandongDongying:Petroleum University Press,1993.
[11]谢里夫.勘探地震学[M].北京:石油工业出版社,1999.Sheriff.Exploration seismology[M].Beijing:Petroleum Indus-try Press,1999.
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