霸县凹陷文安斜坡构造特征与圈闭评价研究
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摘要
油田进入高含水后期和特高含水期开采阶段,进一步提高采收率、挖掘剩余油潜力的难度越来越大,必须进行更加精细的油藏评价和开发。而进行深入的评价和挖潜,必须借助精细油藏描述、精细准确的地层划分和对比等技术和手段对构造特征等进行较细致的研究。
文安斜坡勘探潜力研究表明,富油气凹陷剩余油气资源丰富,缓坡带勘探面积较大,长期处于油气运移的有利指向,是岩性地层油气藏形成的有利区带。通过北文安斜坡成藏条件的研究和已发现油气藏分布规律的分析,阐明文安斜坡的油气藏藏机理和油气富集规律,指明该区的勘探前景。
本文根据高分辨率层序地层学理论,对地层记录中反映基准面变化旋回的时间地层单元进行了划分,从而使地层预测的准确性大大提高。通过地质综合分析,运用平衡剖面技术复原了馆陶组的构造发育情况。结合密度测井曲线制作合成地震记录,将钻遇的地质层位标定在地震反射同相轴上,将地质层位的横向追踪换成对地震同相轴的追踪拾取,从而达到对地下地质构造研究的目的。综合利用相干体自动检测断层异常及地震等时切片等技术,生成相干体切片,总体把握全区构造框架,确立了总体的构造格局和控制性断裂在空间上的展布规律。
最后,根据储层的岩性、物性、所处的沉积相带,将研究区发育的圈闭分为三级,对发现的圈闭作出综合的评价。
The development of the oilfield has entered high water cut stage and extreme high water cut stage. For further improving recovery ratio and development of residual oil were more and more difficult, hence, fine reservoir evaluation became necessary. In order to further evaluation and development, fine reservoir description, stratigraphic classification and correlation were the basic theories to analyze structures characteristics.
Based on the analysis of exploration poetical, Wen’an slope was characterized by abundant residual oil/gas, large prospecting area and located in the favorable route of oil/gas migration, which were the prospects of lithologic and stratigraphic hydrocarbon reservoir.
According to the analysis of hydrocarbon accumulation conditions of north Wen’an slope and distribution rules of proven hydrocarbon reservoir, this paper had summarized hydrocarbon accumulation rules in Wen’an slope, which marked exploration prospects in this area.
This paper had divided time stratigraphic unit which can reflect deleveling in stratigraphic record according to high resolution sequence stratigraphy, which can improve the accuracy of prediction. Based on the synthetic analysis of geology, this paper had built up the tectonic evolution history of Guantao Formation by using technology of balanced cross section. Combined with density logging, synthetic seismogram had been made to calibrate target horizons to seismic events, which had changed geological horizon horizontal tracing into seismic events tracing to meet the aim of geological structures analysis. Based on technologies such as coherent slice and horizontal section, structure framework in this whole area was summarized.
Finally, traps in the study area had been divided into three levels, according to lithology, property and sedimentary facies of the reservoir.
文安斜坡勘探潜力研究表明,富油气凹陷剩余油气资源丰富,缓坡带勘探面积较大,长期处于油气运移的有利指向,是岩性地层油气藏形成的有利区带。通过北文安斜坡成藏条件的研究和已发现油气藏分布规律的分析,阐明文安斜坡的油气藏藏机理和油气富集规律,指明该区的勘探前景。
本文根据高分辨率层序地层学理论,对地层记录中反映基准面变化旋回的时间地层单元进行了划分,从而使地层预测的准确性大大提高。通过地质综合分析,运用平衡剖面技术复原了馆陶组的构造发育情况。结合密度测井曲线制作合成地震记录,将钻遇的地质层位标定在地震反射同相轴上,将地质层位的横向追踪换成对地震同相轴的追踪拾取,从而达到对地下地质构造研究的目的。综合利用相干体自动检测断层异常及地震等时切片等技术,生成相干体切片,总体把握全区构造框架,确立了总体的构造格局和控制性断裂在空间上的展布规律。
最后,根据储层的岩性、物性、所处的沉积相带,将研究区发育的圈闭分为三级,对发现的圈闭作出综合的评价。
The development of the oilfield has entered high water cut stage and extreme high water cut stage. For further improving recovery ratio and development of residual oil were more and more difficult, hence, fine reservoir evaluation became necessary. In order to further evaluation and development, fine reservoir description, stratigraphic classification and correlation were the basic theories to analyze structures characteristics.
Based on the analysis of exploration poetical, Wen’an slope was characterized by abundant residual oil/gas, large prospecting area and located in the favorable route of oil/gas migration, which were the prospects of lithologic and stratigraphic hydrocarbon reservoir.
According to the analysis of hydrocarbon accumulation conditions of north Wen’an slope and distribution rules of proven hydrocarbon reservoir, this paper had summarized hydrocarbon accumulation rules in Wen’an slope, which marked exploration prospects in this area.
This paper had divided time stratigraphic unit which can reflect deleveling in stratigraphic record according to high resolution sequence stratigraphy, which can improve the accuracy of prediction. Based on the synthetic analysis of geology, this paper had built up the tectonic evolution history of Guantao Formation by using technology of balanced cross section. Combined with density logging, synthetic seismogram had been made to calibrate target horizons to seismic events, which had changed geological horizon horizontal tracing into seismic events tracing to meet the aim of geological structures analysis. Based on technologies such as coherent slice and horizontal section, structure framework in this whole area was summarized.
Finally, traps in the study area had been divided into three levels, according to lithology, property and sedimentary facies of the reservoir.
引文
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[10]邹才能,张颖.油气勘探开发实用地震新技术[M]北京:石油工业出版社,2002
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[27]刘和甫,李小军,刘立群.地球动力学与盆地层序及油气系统分析[J].现代地质,2003,17(1):80-86
[28]DuJinhu,YiShiwei,LuXuejun,etal.Complementarity feature of hydrocarbon distribution in oil rich sag[J].Petroleum Science,2004,1(2):79-86
[29]刘震,韩军,关强,等.地层岩性圈闭识别和评价的关键问题[J].西安石油大学学报:自然科学版,2007,22(3):31-37
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[33]张金川,金之钧,袁明生,等.油气成藏与分布的递变序列[J].现代地质,2003,17(3):323-330
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