大民屯凹陷静安堡西侧低潜山油气成藏条件分析
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摘要
对钻井取芯和岩石薄片进行观察及分析化验,确定了组成渤海湾裂谷系大民屯凹陷静安堡西侧低潜山储层的岩石类型主要是碳酸盐岩和变质岩类,储集空间主要是孔隙和裂缝,组成了以缝洞为主的潜山型储层。通过三维地震资料的精细解释与构造成图,发现潜山顶面各类油气圈闭11个。研究结果表明:由于潜山的长期暴露和多期次的构造活动,有利于溶蚀孔洞和裂缝的发育;中新生代复杂的翘倾断块构造活动,形成了类型众多的油气圈闭;上覆老第三系沙三段与沙四段烃源岩厚度大,分布稳定,生油潜力大,因此,区内潜山具备了良好的油气成藏条件;油气运移聚集的主要通道是不整合面和断层,可将油气成藏模式总结为不整合断层联合运移成藏模式、不整合垂向运移成藏模式、断层侧向运移成藏模式和断层微裂隙垂向运移成藏模式。
Based on the study of well-drilling, core rock section and the results of analysis and test datum, it is determined that the main rock types in Western Area of Jing′anpu of damintun depression lying in rift system of Bohai gulf are carbonate rock and metamorphic rock. Pore and fracture are the main reservoir spaces, and they form the burial hill reservoir in study area. Through the three-dimensional seism data explanation and structural mapping, 11 oil and gas traps are found on the top of the burial hill. Because of long-term exposure to atmosphere and many times of tectonic movements, the burial hill type reservoir has been developed. The main reservoir capacity is pore and aperture. The main source rock is the Sha-3 member and the Sha-4 member of Paleogene that covered the reservoir. Because the source rock is thick and spreading steadily, there exists great potential for hydrocarbon generation. The main path for hydrocarbon migration and accumulation is unconformities and faults. On this basis, the model of hydrocarbon pool forming process can be concluded into four types as follows: migration and accumulation by unconformity and fault, vertical migration and accumulation by fault, lateral migration and accumulation by faults and vertical migration and accumulation by fault and micro-fracture.
Based on the study of well-drilling, core rock section and the results of analysis and test datum, it is determined that the main rock types in Western Area of Jing′anpu of damintun depression lying in rift system of Bohai gulf are carbonate rock and metamorphic rock. Pore and fracture are the main reservoir spaces, and they form the burial hill reservoir in study area. Through the three-dimensional seism data explanation and structural mapping, 11 oil and gas traps are found on the top of the burial hill. Because of long-term exposure to atmosphere and many times of tectonic movements, the burial hill type reservoir has been developed. The main reservoir capacity is pore and aperture. The main source rock is the Sha-3 member and the Sha-4 member of Paleogene that covered the reservoir. Because the source rock is thick and spreading steadily, there exists great potential for hydrocarbon generation. The main path for hydrocarbon migration and accumulation is unconformities and faults. On this basis, the model of hydrocarbon pool forming process can be concluded into four types as follows: migration and accumulation by unconformity and fault, vertical migration and accumulation by fault, lateral migration and accumulation by faults and vertical migration and accumulation by fault and micro-fracture.
引文
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[2] 潘元林,孔凡仙,杨申镳.中国隐蔽油气藏[M].北京:地质出版社,1998.PAN Yuan lin,KONG Fan xian,YANG Shen biao.ConcealedReservoir inChina[M].Beijing:GeologyPress,1998.
[3] 谯汉生,袁选俊,牛嘉玉.渤海湾盆地隐蔽油气藏勘探[M].北京:石油工业出版社,1999.QIAO Han sheng,YUAN Xuan jun,NIU Jia yu.ConcealedReservoirExploration inBasin ofBohaiBay[M].Beijing:OilIndustryPress,1999.
[4] 华北石油勘探开发设计研究院.华北碳酸盐岩潜山油藏开发[M].北京,石油工业出版社,1985.Institute ofHuabeiPetroleumExploration andDevelop ment.ReservoirDevelopment of theCarbonateBurialHillinHuabeiArea[M].Beijing:OilIndustryPress,1985.
[5] 郭建华.塔里木盆地轮南地区奥陶系潜山古岩溶及其对储层控制的非均质性[J].沉积学报,1993,11(1):5663.GUO Jian hua.BurialHillPalaeokarst andItsCon trolledReservoirHeterogeneity inOrdovician,LunnanReign ofTarimBasin[J].ActaSedimentologicaSinica,1993,11(1):5663.
[6] 郭建华.塔北、塔中地区下古生界深埋藏古岩溶[J].中国岩溶,1996,15(3):207216.GUO Jian hua.On thePalaeokarst ofLowerPalaeozoicGroupTarbei andTarzhongRegions ofTarim[J].Car sologicaSinica,1996,15(3):207216.
[7] 郭建华,覃汉生,赵力民.轮南潜山构造油气藏与油气富集条件[J].江汉石油学院学报,1993,15(1):1420.GUO Jian hua,QIN Han sheng,ZHAO Li min.Oil&Gas andEnrichmentConditions inLunnanBasinHillStructure[J].Journal ofJianghanPetroleumInstitute,1993,15(1):1420.
[8] 袁先春,赵新国,刘小红,等.东濮凹陷古潜山勘探潜力分析[J].石油勘探与开发,2001,28(2):2932.YUAN Xian chun,ZHAO Xin guo,LIU Xiao hong, etal.FormationModels ofBuriedHillTypePools inDongpuSag[J].PetroleumExploration andDevelop ment,2001,28(2):2932.
[9] 王必金,曾 芳,刘启凤,等.江汉盆地古潜山勘探前景展望[J].江汉石油学院学报,2002,24(4):1315.WANG Bi jin,ZENG Fang,LIU Qi feng, et al.Ex plorationProspects ofBuriedHill inJianghanBasin[J].Journal ofJianghanPetroleumInstitute,2002,24(4):1315.
[10] 辽河油田石油地质志编辑委员会.中国石油地质志(卷三):辽河油田[M].北京:石油工业出版社,1993.EditorialCommittee ofPetroleumGeology ofChina.PetroleumGeology ofChina(Vol.3):LiaoheOilField[M].Beijing:OilIndustryPress,1993.
[11] 吴智勇,郭建华,吴东胜.大民屯凹陷静安堡西侧低潜山变质岩储层裂缝发育特征[J].石油与天然气地质,2001,22(4):322325.WU Zhi yong,GUO Jian hua,WU Dong sheng.Frac turedCharacteristics ofMetamorphicReservoirs inLowBuriedHill inWest ofJing’anpu,DamintunDepression[J].Oil&GasGeology,2001,22(4):322325.
[12] 曾联波,任德生.大民屯凹陷静52断块油藏裂缝参数研究[J].断块油气藏,1998,5(4):2932.ZENG Lian bo,REN De sheng.Study ofFracturePa rameter ofJing52FaultedReservoir inDamintunDepres sion[J].Fault blockOilPool,1998,5(4):2932.
[13] 揭克常.东胜堡变质岩油藏[J].北京:石油工业出版社,1997.JIE Ke chang.DongshengpuMetamorphicRockPool[J].Beijing:OilIndustryPress,1997.
[14] 叶加任,王连进,邵 荣.油气成藏动力学中的流体动力场[J].石油与天然气地质,1999,20(2):182185.YE Jia ren,WANG Lian jin,SHAO Rong.FluidDy namicFields inPoor formingDynamics ofOil andGas[J].Oil&GasGeology,1999,20(2):182185.
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