柴达木盆地德令哈地区油气资源潜力评价
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摘要
柴达木盆地德令哈地区侏罗系勘探程度较低,钻遇主要烃源岩发育层段侏罗系的探井仅德参1井,且完钻层位为上侏罗统,而通过地震剖面解释成果发现德令哈坳陷内大面积分布侏罗系,因此对于该区侏罗系的研究评价工作中野外地质考察尤为重要,在大量野外地质调查及样品采集、分析化验的基础上对侏罗系的油气资源潜力进行了研究,发现德令哈地区最重要的一套烃源岩是中侏罗统暗色泥岩、油页岩、碳质泥岩和煤,为一套"中等—好"烃源岩,有机质丰度较高,有机碳质量分数绝大多数为1.5%～10%,氯仿沥青"A"质量分数为0.101%～0.448%,总烃量为1 104～1 513μg.g-1,有机质类型以腐泥腐殖型—腐殖型(Ⅱ—Ⅲ型)为主,并且已经进入成熟阶段,通过综合研究估算研究区生油量约为42.77×108 t,资源量约为3.83×108 t,具有较大的勘探潜力。
A low degree of exploration is the actuality of Delingha Area in Qaidam Basin.One exploratory well named Decan 1 is drilled out the upper Jurassic stratum which developed hydrocarbon source rocks.But the interpretation achievements of seismic profile indicate that Jurassic stratum is widely distributed over the Delingha Sag.Therefore,field reconnaissance work is very important for the research of the area.Resource potential of oil and gas is studied based on the field reconnaissance,specimen rock acquisition and chemical analysis,which shows that the most important hydrocarbon source rocks are melanocratic mudstone,oil shale,carbonaceous mudstone and coal in the middle Jurassic.Hydrocarbon source rocks are middle to good.The organic matter abundance is high and reaches from 1.5% to 10%,the content of chloroform asphalt A is from 0.101% to 0.448%,and the content of total hydrocarbon is from 1 104 ppm to 1 513 ppm.The organic matter type is mainly formed as Ⅱ～Ⅲ and has been mature.Oil generating yield is about 42.77 hundred million tons and the resource number is 3.83 hundred million tons with rather large potential.
A low degree of exploration is the actuality of Delingha Area in Qaidam Basin.One exploratory well named Decan 1 is drilled out the upper Jurassic stratum which developed hydrocarbon source rocks.But the interpretation achievements of seismic profile indicate that Jurassic stratum is widely distributed over the Delingha Sag.Therefore,field reconnaissance work is very important for the research of the area.Resource potential of oil and gas is studied based on the field reconnaissance,specimen rock acquisition and chemical analysis,which shows that the most important hydrocarbon source rocks are melanocratic mudstone,oil shale,carbonaceous mudstone and coal in the middle Jurassic.Hydrocarbon source rocks are middle to good.The organic matter abundance is high and reaches from 1.5% to 10%,the content of chloroform asphalt A is from 0.101% to 0.448%,and the content of total hydrocarbon is from 1 104 ppm to 1 513 ppm.The organic matter type is mainly formed as Ⅱ～Ⅲ and has been mature.Oil generating yield is about 42.77 hundred million tons and the resource number is 3.83 hundred million tons with rather large potential.
引文
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[2]孙道武.柴西阿尔金山前红沟子地区中生界生储盖研究[J].断块油气田,2007,14(2):21-23.
[3]陈晓云,罗群.叠合盆地石油地质特征及其研究意义[J].断块油气田,2006,13(5):7-14.
[4]青海油气区石油地质志编写组.中国石油地质志(卷十四):青海油气区[M].北京:石油工业出版社,1990:1-10.
[5]吴丽荣,黄成刚,黄昌武.柴达木盆地德令哈地区侏罗系成岩作用研究[J].断块油气田,2007,14(3):12-15.
[6]黄杏珍,邵宏舜.柴达木盆地的油气形成与寻找油气田方向[M].兰州:甘肃科学出版社,1993:1-7.
[7]陈启林,阎存凤,陈迎宾,等.柴北缘东区中下侏罗统油气地质特征.天然气工业[J],2005,25(增刊B):37-41.
[8]袁剑英,陈启林,陈迎宾,等.柴达木盆地油气地质特征与有利勘探领域[J].天然气地球科学,2006,17(5):640-644.
[9]卢长武.稳定同位素地球化学[M].四川:成都地质学院出版社,1986:35-52.
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