CAJ | 학술논문

利用油气包裹体丰度、包裹体岩相学、包裹体荧光光谱和显微测温分析,研究塔里木盆地塔中地区奥陶系储集层油气成藏史.流体包裹体分析首先研究包裹体岩相学,即借助紫外-可见光和荧光光谱划分包裹体组合,再选择包裹体组合内的盐水包裹体和油包裹体开展显微荧光光谱、显微测温研究,最后根据均一温度、冰点温度并结合PVT模拟分析油气充注史.包裹体分析应注意:①样品的选择和处理;②利用包裹岩相学,综合包裹体组合和显微荧光光谱分析油气充注期次和成藏史;③确定所用盐水包裹体是成岩次生产物且与油气包裹体共生,避免利用数量不足或者没有严格分期次的包裹体数据来解释油气充注期次和时间;④结合井底温度,考虑碳酸盐岩中包裹体捕获后的再平衡以及包裹体超压捕获对流体包裹体温度和盐度的影响.流体包裹体显微测温结果揭示塔中奥陶系储集层至少存在两期油充注,存在低盐度、中等盐度、高和超高盐度的4种类型地层水,后两者可能与塔中潜山带变形引起的咸水流动有关.图5表3参37
이용유기포과체봉도、포과체암상학、포과체형광광보화현미측온분석,연구탑리목분지탑중지구오도계저집층유기성장사.류체포과체분석수선연구포과체암상학,즉차조자외-가견광화형광광보화분포과체조합,재선택포과체조합내적염수포과체화유포과체개전현미형광광보、현미측온연구,최후근거균일온도、빙점온도병결합PVT모의분석유기충주사.포과체분석응주의:①양품적선택화처리;②이용포과암상학,종합포과체조합화현미형광광보분석유기충주기차화성장사;③학정소용염수포과체시성암차생산물차여유기포과체공생,피면이용수량불족혹자몰유엄격분기차적포과체수거래해석유기충주기차화시간;④결합정저온도,고필탄산염암중포과체포획후적재평형이급포과체초압포획대류체포과체온도화염도적영향.류체포과체현미측온결과게시탑중오도계저집층지소존재량기유충주,존재저염도、중등염도、고화초고염도적4충류형지층수,후량자가능여탑중잠산대변형인기적함수류동유관.도5표3삼37
This paper presents an integrated workflow for investigating hydrocarbon charge history using fluid inclusions using the Ordovician reservoirs from the Tazhong Oilfield, Tarim Basin as an example. The work flow involves the delineation of fluid inclusion assemblage (FIA) using fluid inclusion petrography and spectroscopy for microthermometric analysis. The interpretation of microthermometric data is based on data derived from synthetic inclusion experiments and takes consideration of the P-T re-equilibration of fluid inclusions in carbonate and over pressure effect on fluid inclusion trapping. The workflow also emphasizes on the requirements of adequate sample preparation, FIA identification, quantitative spectroscopic data (CIE), coeval petroleum and aqueous fluid inclusions, adequate number of microthermometric measurements and integrated interpretation using borehole temperature. In the study reservoirs in the Tazhong area, fluid inclusion spectroscopy reveals the presence of three groups of oil inclusions of near yellow, near blue and near white fluorescence colours. The fluid inclusion microthermometry data indicate the presence of at least two predominant hydrocarbon fluid inclusion assemblages including:homogenous liquid phase yellow fluorescence inclusions and liquid phase oil and condensate fluid inclusion assemblages with homogenous near blue, near white and near yellow fluorescence colours. The aqueous inclusions from the Ordovician reservoirs in the Tazhong area reveal the presence of low, moderate, high and very high salinities in the reservoirs. The extremely high salinity is believed to be caused by regional brine intrusions relating to regional structural movement and deformation.