保山盆地上第三系烃源岩地化特征及气源潜力评价

Evaluation of geochemical characteristics of hydrocarbon source rock and
gas-generating potential in Upper Tertiary, Baoshan Basin

陈义才 沈忠民 罗小平 高玲 蔡勋育 胡东风 陈昭全

成都理工大学，四川 成都 610059 中国石油化工集团公司南方勘探开发分公司，云南 昆明 650200

保山盆地上第三系羊邑组和南林组属于湖泊-扇三角洲沉积体系，暗灰色泥质烃源岩厚度为400 ~ 1 000 m。根据8口井98个样品的有机地球化学分析数据统计，泥质烃源岩有机碳质量分数平均值为0.85%，游离态烃和裂解烃量（S1+S2）为0.81 ~ 92.05 mg·g-1。镜检、岩石热解和生物标志物分析资料表明，烃源岩有机质类型主要为混合型，含少量腐殖型，热演化程度处于未成熟阶段。根据生物气的形成条件和烃源岩的分布特征，应用有机碳产烃率法分别计算了羊二段、羊三段和羊4-南林组的产气强度。

The Yangyi Formation (N2y) and Nanlin Formation (N1n) in Upper Tertiary of Baoshan Basin belong to the lake-fan delta
deposition system.The thickness of dark argillaceous hydrocarbon source rocks is about 400-1 000 m. Based on the organic
geochemical analysis of 98 samples from 8 wells,the organic carbon average value of argillaceous hydrocarbon source rocks is
0.85%,free hydrocarbon and cracking hydrocarbon volumes are 0.81 to 92.05 milligrams per gram. The microscope examination,
rock pyrolysis and biomarker analysis data indicate that the hydrocarbon source rocks are mainly the mixed type. The source rocks
are in thermal evolution immature stage. Based on the formation condition of biogas and the distribution of source rocks,by the
methods of organic carbon hydrocarbon-producing rate,the paper calculates the gas production intensity of N2y2 section,N2y3
section,N2y4 and N1n Formations respectively. The total gas production of the basin is 80.10 billion cubic meters. The westen
subconcave of Baiyantun Basin is favorable hydrocarbon-producing zone,and the gas-producing intensity is at 0.6 to 2.1 billion
cubic meters per square kilometer.