G油田古近系重力流水道相储层预测研究
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摘要
重力流水道砂体多分布于半深湖、深湖的暗色泥岩中,具有良好的成藏条件,但其厚度小,分布零散,埋藏深度大,预测困难。以G油田主要开发层位沙一中、下亚段为研究目标,该区重力流水道砂体广泛分布,具有泥包砂的沉积特点,岩性致密,物性较差,属典型超高压深层低渗透油藏。在借鉴区域研究成果的基础上,通过岩心、测井、地震基准面旋回识别,建立高精度等时地层格架;通过地震统计分析,利用测井资料和井旁地震数据,估计子波振幅谱和相位谱,并用最小平方法提取子波,进行精细标定,落实层面和断层解释;利用LandMark软件Poststack模块,选取具有代表性的地震波形作为学习样板,进行波形结构分析。针对测井约束反演存在多解性的缺点,提出相控反演的思路,通过多种资料的综合来建立初始波阻抗模型,这种初始波阻抗模型的优点在于更接近实际地质情况,能够剔除非储层区的干扰,可以从宏观上反映出目的层段的沉积相展布形态。基于此模型进行反演,更易于预测储层分布范围,更易于对层内砂体进行解释、追踪,刻画出小层内砂体的分布特征。
Sand body of the gravity flow channel distributes in dark mudstones of half-deep and deep lake mostly,which has good reservoir-forming conditions but is hard to forecast for thin layers,scattered distribution and deep burial depth.The main producing position,middle-lower Sha 1 member of the G oilfield is studied.Sand body of the gravity flow channel in this area belongs to deep and low-permeability oil reservoir at ultrahigh pressure with the characteristics of wide distribution,sedimentation of sand in mud,densify lithology and poor physical property.Based on regional research results,high resolution chronostratigraphic framework was built through the identification of base-level cycles in core,logging and seismic data.Amplitude spectrum and phase spectrum of the wavelet were evaluated by using logging data and well-side seismic data through earthquake statistic analysis.And the wavelet was extracted by the least square method,and then was calibrated in detail so as to make bed plane and fault interpretation ascertained.The typical seismic waveform was analyzed on the structure by Poststack module of LandMark software.Since logging constrained inversion has the shortcoming of ambiguity,inversion by phase control is proposed.Primary wave impedance model is built through the comprehension of multiple data,which has the advantage of being close to the actual geological condition,and getting rid of the interference from non-reservoir area.And it can reflect the distribution form of the sedimentary facies in the intended interval on the macroscopic.The inversion based on this model is easier for forecasting distribution range of the reservoirs,and for interpreting and tracing on intraformational sand body and for knowing the distribution characteristics of the sand body among subzones.
Sand body of the gravity flow channel distributes in dark mudstones of half-deep and deep lake mostly,which has good reservoir-forming conditions but is hard to forecast for thin layers,scattered distribution and deep burial depth.The main producing position,middle-lower Sha 1 member of the G oilfield is studied.Sand body of the gravity flow channel in this area belongs to deep and low-permeability oil reservoir at ultrahigh pressure with the characteristics of wide distribution,sedimentation of sand in mud,densify lithology and poor physical property.Based on regional research results,high resolution chronostratigraphic framework was built through the identification of base-level cycles in core,logging and seismic data.Amplitude spectrum and phase spectrum of the wavelet were evaluated by using logging data and well-side seismic data through earthquake statistic analysis.And the wavelet was extracted by the least square method,and then was calibrated in detail so as to make bed plane and fault interpretation ascertained.The typical seismic waveform was analyzed on the structure by Poststack module of LandMark software.Since logging constrained inversion has the shortcoming of ambiguity,inversion by phase control is proposed.Primary wave impedance model is built through the comprehension of multiple data,which has the advantage of being close to the actual geological condition,and getting rid of the interference from non-reservoir area.And it can reflect the distribution form of the sedimentary facies in the intended interval on the macroscopic.The inversion based on this model is easier for forecasting distribution range of the reservoirs,and for interpreting and tracing on intraformational sand body and for knowing the distribution characteristics of the sand body among subzones.
引文
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[8]王金铎,韩文功,于建国,等.东营凹陷沙三段浊积岩沉积体系及其油气勘探意义[J].石油学报,2003,24(6):24-29.
[9]罗红梅.地震属性技术在现河地区滑塌浊积岩油藏勘探的应用[J].工程地球物理学报,2005,2(3):224-227.
[10]张建宁.牛庄洼陷浊积岩砂体储层物性地震预测方法[J].石油地球物理勘探,2005,40(6):716-720.
[2]WYNN R B,PIPER D J W,GEE M J R.Generation and mi-gration of coarse-grained sediment waves in turbidity currentchannels and channel-lobe transition zones[J].Marine Geology,2002,192(1-3):59-78.
[3]ESCHARD R,ALBOUY E,DESCHAMPSA R,et al.Downstreamevolution of turbiditic channel complexes in the Pab Rangeoutcrops(Maastrichti an,Pakistan)[J].Marine and PetroleumGeology,2003,20(6-8):691-710.
[4]吴崇筠.湖盆砂体类型[J].沉积学报,1986(4):1-27.
[5]姜在兴.一种沿深水箕状谷纵向搬运的重力流沉积[J].石油实验地质,1988,10(2):106-115.
[6]袁静,徐根旺.东营凹陷永554古近系沙四段沟道浊积岩相模式[J].煤田地质与勘探,2003,31(6):11-14.
[7]胡耀军,陈昭年,刘伟兴,等.大港滩海区沙一段下部重力流水道沉积特征分析[J].断块油气田,2002,9(1):18-22.
[8]王金铎,韩文功,于建国,等.东营凹陷沙三段浊积岩沉积体系及其油气勘探意义[J].石油学报,2003,24(6):24-29.
[9]罗红梅.地震属性技术在现河地区滑塌浊积岩油藏勘探的应用[J].工程地球物理学报,2005,2(3):224-227.
[10]张建宁.牛庄洼陷浊积岩砂体储层物性地震预测方法[J].石油地球物理勘探,2005,40(6):716-720.
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