柴达木盆地德令哈地区油气资源潜力评价

Evaluation of oil and gas resource potential in Delingha Area of Qaidam Basin

黄成刚 陈启林 阎存凤 张正刚 陈迎宾 石亚军

中国石油勘探开发研究院西北分院，甘肃 兰州 730020

(Northwest Subsidiary of Exploration and Development Research Institute, CNPC, Lanzhou 730020, China),

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 ～ 1 513 μg·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~Ⅲand 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.