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通过对钻井、录井、岩心化验、试油等资料的研究,结合区域勘探成果,分析了查干油田的基本石油地质特征。研究表明,下宗巴音组下段发育200m左右的油泥岩和暗色泥岩,有机质类型为Ⅱ1型,镜质体反射率平均值为0.7%,生烃指标好,评价为优质烃源岩;查干油田处于“凹中隆”上,其西、北、东三面被生油洼陷环绕,成为捕捉油气最有利的场所。查干组和下宗巴音组发育扇三角洲前缘水下分流河道和席状砂微相,查1和查27断块油藏储层物性好,为中孔中渗透储层;查14断块油藏为中孔低渗透储层。通过成藏特征分析认为,中央断裂背斜带因近油源、纵向上输导条件好而成为油气聚集的有利构造带,并且与良好的储集相带相匹配,为查干油田的形成创造了条件。
Through the study of drilling, mud logging, core testing and oil testing, combined with the regional exploration results, the basic petroleum geological characteristics of Chagan Oilfield are analyzed. The results show that the Lower Zongba Formation developed mudstone and dark mudstone of about 200m in the lower part of the Lower Zongba Formation. The organic matter type is Type II1, the average vitrinite reflectance is 0.7%, and the hydrocarbon generation indicator is good, which is evaluated as high quality source rock. The oil field is located in the “concave Long”, its west, north and east sides are surrounded by oil sags, become the most favorable place to capture oil and gas. Chagan and Zongba groups developed subaqueous submarine distributary channels and sheet-like sand microfacies in the fan delta front. The physical properties of reservoirs in Chazhan 1 and Chazhan 27 are good and are medium-permeability medium reservoirs; Block reservoirs are medium-porosity and low-permeability reservoirs. According to the analysis of reservoir forming characteristics, the central fault anticline was favorable for oil and gas accumulation due to favorable oil source and vertical transport conditions, and matched with good reservoir facies to create the formation of the Chagan oilfield Conditions.