共查询到18条相似文献,搜索用时 834 毫秒
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《海洋地质与第四纪地质》2010,(3)
参考"石油天然气地球化学勘查技术规范"数据处理、异常评价与解释的要求,充分应用地理信息系统(GIS)可视化技术、空间分析功能、图层叠置功能,智能计算出海域油气化探异常系数,包括异常强度、异常面积、异常衬度、异常点数等指标。结合相关地质条件,耦合了神经网络、模式识别等数学模型,开发了具有自主知识产权的海域油气化探综合评价软件,并将该软件应用于实际工作中,取得了较好的效果。 相似文献
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东海陆架盆地油气化探远景区的探讨地矿部上海海洋地质调查局李维显1工作概况1988—1991年我局与石海局培训化探中心合作,在东海西湖凹陷中南部结合工程地质调查进行多指标的油气地球化学勘查。1988年发现平湖断裂带及海礁凸起油气化探异常,促进了东海西湖... 相似文献
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地矿部在我国海域第一份较全面.系统的油气地球化学勘探报告——“东海西湖凹陷平湖地区迎翠轩地区油气地球化学勘探报告”,1994年6月在上海通过了由上海海洋地质调查局、地矿部石油地质海洋地质局、合肥化探中心、物化探研究所有关专家组成的评审委员会的评审. 相似文献
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我国海域油气化探的基本特点 总被引:10,自引:0,他引:10
根据长期生产与科研资料,总结了我国不同海域海底表层沉积物中酸解烃、物上气、荧光光谱、紫外吸收光谱、蚀变碳酸盐、热释汞、氦、金属微量元素及海水中溶解烃、苯、酚等指标含量的分布特征、变化规律及其与油气藏的关系,发现我国不同海区地球化学空间变化较大、差异明显。在纵向上由深到浅化探指标呈向梯度变化,油气微运移的地球化学形迹明显。化探异常比较集中出现在凹陷周边,而隆起区化探异常较少,强度较弱。化探指标组合与特点表明,各海区以寻找轻质油与天然气为主。筛选出的适于海域油气化探的技术方法系列是:综合烃类气体法(包括吸附烃、游离烃、吸留烃、水溶烃)和芳烃光谱法,在抑制干扰因素和进行定量校正后,它们是指标示油气藏较灵敏的指标,而近海底海水化学成分连测技术是今后油气化探、开发的重要方向。实践证明化探是寻找海域油气藏的直接和有效的方法。 相似文献
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采用沉积物、海水等不同介质,应用7种方法在台西盆地某坳陷开展了油气地球化学综合调查。根据指标间的相关性、共生与伴生组合等进行指标分类和统计分析,在地球化学场和场源分析的基础上,结合地质-地球物理资料,圈定3个Ⅰ级异常区、2个Ⅱ级异常区和2个Ⅲ级异常区,为该坳陷油气远景评价提供了可信的地球化学依据。同时,也证实了化探方法和指标海洋油气资源勘探中的有效性。 相似文献
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井中油气地球化学勘探技术研究立足于油气运移的理论,是通过分析钻井岩屑(岩心)中不同赋存状态的烃类化探指标含量,研究不同化探方法指标含量在钻井剖面上的分布特征及变化规律,建立井中油气地球化学剖面,探索研究油气垂向微运移规律,生、储、盖层化探指标变化与组合特征,从而达到判别储层含油气性、评价烃源岩特征、评价盖层特征等石油地质目的,为油气勘探提供地球化学依据。 相似文献
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BTEX异常对海域油气藏指示作用的研究 总被引:2,自引:0,他引:2
常规的油气化探方法一般是应用烷烃类作为油气勘探的基本指标,但是烷烃类易受人类活动和生物活动的干扰,使常规的化探技术在油气勘探中一直受到限制。人们开始考虑采用直接的生物标记化合物来预测油气藏,如芳烃系列中的苯系化合物苯(benzene)、甲苯(toluene)、乙苯(ethylbenzene)、二甲苯(xylem),简称BTEX。国内外研究表明,BTEX基本不受人类活动和生物活动的干扰,对油气藏具有良好的指示作用。依据南海某区的实测资料,采用自主研发的油气化探可视化评价软件进行数据处理,剥离背景异常,圈出有效的BTEX异常,并与靶区地层剖面进行了对比,结果证实了BTEX对海域油气藏具有良好的指示作用。 相似文献
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It is a conventional method for petroleum prospecting to generally use paraffin hydrocarbon as basic indexes of oil and gas. This conventional geochemical technology, however, shows some limits in the prospecting as paraffin is vulnerable to influences from human and biologic activities. Consequently, BTEX (short for benzene, toluene, ethyl benzene and xylem, which are direct biomarkers) among aromatic hydrocarbon series has been taken into account for the oil and gas prediction. Domestic and foreign study results demonstrate that BTEX is hardly disturbed and can well indicate oil and gas reservoirs. Based on measured data from a South China Sea area, the present authors have used self-developed visual assessment software for petroleum prospecting has been used to process data, strip background anomalies, and outline significant BTEX anomalies. By comparison with stratigraphic profiles of the target area, it is confirmed that BTEX is a good indication of marine oil and gas during the petroleum prospecting. 相似文献
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This article reviews the abnormal characteristics of shale gases (natural gases produced from organic-rich shales) and discusses the cause of the anomalies and mechanisms for gas enrichment and depletion in high-maturity organic-rich shales. The reported shale gas geochemical anomalies include rollover of iso-alkane/normal alkane ratios, rollover of ethane and propane isotopic compositions, abnormally light ethane and propane δ13C values as well as isotope reversals among methane, ethane and propane. These anomalies reflect the complex histories of gas generation and associated isotopic fractionation as well as in-situ “mixing and accumulation” of gases generated from different precursors at different thermal maturities. A model was proposed to explain the observed geochemical anomalies. Gas generation from kerogen cracking at relatively low thermal maturity accounted for the increase of iso-alkane/normal alkane ratios and ethane and propane δ13C values (normal trend). Simultaneous cracking of kerogen, retained oil and wet gas and associated isotopic fractionation at higher maturity caused decreasing iso-alkane/normal alkane ratios, lighter ethane and propane δ13C and corresponding conversion of carbon isotopic distribution patterns from normal through partial reversal to complete reversal. Relatively low oil expulsion efficiency at peak oil generation, low expulsion efficiency at peak gas generation and little gas loss during post-generation evolution are necessary for organic-rich shales to display the observed geochemical anomalies. High organic matter richness, high thermal maturity (high degrees of kerogen-gas and oil-gas conversions) and late-stage (the stage of peak gas generation and post-generation evolution) closed system accounted for gas enrichment in shales. Loss of free gases during post-generation evolution may result in gas depletion or even undersaturation (total gas content lower than the gas sorption capacity) in high-maturity organic-rich shales. 相似文献
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K.K. Abdul Azeez T. Satish Kumar Sharana Basava T. Harinarayana A.M. Dayal 《Marine and Petroleum Geology》2011,28(5):1073-1082
As the Mesozoic sediments contribute most of the oil and gas reserves of the world, we present an integrated interpretation approach using magnetotellurics (MT) and surface geochemical prospecting studies to demarcate hydrocarbon prospective Gondwana (Mesozoic) formations underneath the Deccan flood basalts of Late Cretaceous age across Narmada-Tapti rift (between Bhusawal and Barwah) in Central India. The MT interpretation shows deep (∼5 km) basement structure between southern and central part of the MT profile however, it gradually becomes shallower to either ends of the profile with a predominant basement depth reduction in the northern end compared to the southern end. The geophysical results suggest thick (2-3.5 km) Mesozoic sediments in the area characterized by deep basement structure. The geochemical analysis of the near surface soil samples indicate higher concentrations of light gaseous hydrocarbons constituents over the area marked with thick sub-basalt Mesozoic formations. Analyses of the geochemical data imply that these hydrocarbons are genetically related, generated from a thermogenic source and these samples fall in the oil-producing zone. The temperature-depth estimations in the region supports favorable temperature conditions (80-120 °C) for oil generation at basement depths. 相似文献