塔里木盆地塔中地区奧陶系古潜山的地质地球物理特征和控制因素
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摘要
奧陶系碳酸盐岩古潜山是塔里木盆地古生代的主要油气储层类型。塔中地区下奥陶统发育有三套灰岩/白云岩岩溶层,主要形成于早石炭世,单层厚几米至几十米。洞穴层的电测曲线特征表现为两高两低:低电阻和低密度,高声波时差和高自然伽玛;地震反射层表现为弱振幅、波数增多、水平反射短轴3项地震反射异常。潜山顶部古风化壳发育程度受构造条件(包括构造裂隙)、岩性、古潜水面海平面变化以及古气候等因素控制
Ordovician buried hills of carbonates are importantrese rvoirs of oil and gas in Tarim Basin. Three lved dolomite/calcite layers were recognized in the vertical sequence of the Ordovician in Central Tarim Basin. They formed during Carboniferous and with single sickness of ca. ten to some tens meters. Well-logging of the dissolved layers shows low in both resistivity(RD & RS)and density(DEN)and high in acoustic log(AC) and gamma-ray(GR). Their seismic reflections show weak amplitude,multiple wavenumber,anomaly of frequency,amplitude and velocity. The controlling factors on the Ordovician buried hills in the Central Tarim Basin mainly include structure,lithology,palaeowater table,sea level change and palaeoclimate.
Ordovician buried hills of carbonates are importantrese rvoirs of oil and gas in Tarim Basin. Three lved dolomite/calcite layers were recognized in the vertical sequence of the Ordovician in Central Tarim Basin. They formed during Carboniferous and with single sickness of ca. ten to some tens meters. Well-logging of the dissolved layers shows low in both resistivity(RD & RS)and density(DEN)and high in acoustic log(AC) and gamma-ray(GR). Their seismic reflections show weak amplitude,multiple wavenumber,anomaly of frequency,amplitude and velocity. The controlling factors on the Ordovician buried hills in the Central Tarim Basin mainly include structure,lithology,palaeowater table,sea level change and palaeoclimate.
引文
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[2]WANG Pu-jun,ZHANG Yan,CHENG Ri-hui,etal.Sedi-mentary facies and evolution of theTarimBasin,Xin-jiang,NW China[C]//ProcSino-GermanSympGeolEvolEnvironmChanges ofXinjiang,China,April,2004:61-64.
[3]魏国齐,贾承造,姚慧君.塔北地区海西晚期逆冲-走滑构造与含油气关系[J].新疆石油地质,1995,16(2):96-102.WEI Guo-qi,JIA Cheng-zao,YAO Hui-jun.The relation of thrust-strike slip structure and hydrocarbon potential in late ofHercynian in north area ofTarimBasin[J].XinjiangPetroleumGeology,1995,16(2):96-102.
[4]杨松岭,高增海,赵秀歧.塔里木盆地东河砂岩层序特征和分布规律[J].新疆石油地质,2002,23(1):35-38.YANG Song-ling,GAO Zeng-hai,ZHAO Xiu-qi.The cha-racteristic and distribution ofDonghe sandstone sequ-ences inTarimBasin[J].XinjiangPetroleumGeology,2002,23(1):35-38.
[5]翟晓先,俞仁连,何发岐,等.塔河地区奧陶系一间房组微裂隙颗粒灰岩储集体的发现与勘探意义[J].石油实验地质,2002,24(5):387-392.ZAI Xiao-xian,YU Ren-lian,HE Fa-qi,etal.Discovery and exploration significance of micro-fissure grain lime-stone reservoir in theOrdovicianYijianfangFormation ofTahe area[J].PetroleumGeologyandExperiment,2002,24(5):387-392.
[6]周永昌,王新维,杨国龙.塔里木盆地阿克库勒地区奧陶系碳酸盐岩成藏条件及勘探前景[J].石油与天然气地质,2000,21(2):104-109.ZHOU Yong-chang,WANG Wei-xin,YANG Guo-long.Oil and gas pool forming condition and exploration pro-spects ofOrdovician carbonate rocks inAkekule region,TarimBasin[J].Oil&GasGeology,2000,21(2):104-109.
[7]叶德胜.塔里木盆地北部寒武—奧陶系碳酸盐岩的深部熔蚀作用[J].沉积学报,1994,12(1):66-71.YE De-sheng.Deep dissolution ofCambrian-Ordovician carbonates in the northTarimBasin[J].ActaSedimento-logicaSinica,1994,12(1):66-71.
[8]杨威,魏国齐,王清华,等.和田河气田奧陶系碳酸盐岩储层特征及建设性成岩作用[J].天然气地球科学,2003,14(3):191-195.YANG Wei,WEI Guo-qi,WANG Qing-hua,etal.Carb-onate rock reservoir and constructive diagenesis ofOr-dovician inHetian gas field,TarimBasin[J].NaturalGasGeoscience,2003,14(3):191-195.
[9]周立国,董斌,李冬梅.塔河油田古潜山油气藏测井技术浅析[J].油气测井技术,2003,12(2):44-48.ZHOU Li-guo,DONG Bin,LI Dong-mei.The brief analy-sis of completion techniques to buried hill oil and gas reservoirs inTahe oilfield[J].Oil&GasLoggingTech-niques,2003,12(2):44-48.
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