摘要
对青南洼陷沙四段上亚段、沙三段烃源岩地球化学特征的研究结果表明,沙四段上亚段烃源岩为优质烃源岩,其形成于快速沉降和欠补偿沉积条件、咸水—半咸水过渡到淡水的沉积环境;有机质丰度高,63.2%的样品有机碳含量大于2%,50%的样品氯仿沥青“A”含量大于0.2%,84%的样品生烃潜量大于9;有机质类型好,干酪根以Ⅰ型和Ⅱ1型为主,镜下鉴定Ⅰ型占50%,Ⅱ1型占43%。多种指标对烃源岩演化研究表明,沙四段上亚段下部烃源岩已进入生烃高峰期,沙四段上亚段上部大部分已成熟,沙三段下亚段成熟度较低。盆地模拟资源量估算结果表明,沙四段上亚段资源潜力为102.76×106t。
The study of the geochemical characteristics of the source rocks in Es3 and upper Es4 of Qingnan Sugsag indicates that upper Es4 possess high-quality source rocks formed in rapid subsidence and undercompensation deposition condition in saline to fresh water environments. It has an abundant organic matter with 63. 2% of the samples containing more than 2% of organic carbon,50% of the samples bearing 0.2% chloroform asphalt 'A' and 84% of the samples showing over 9 of potential hydrocarbon S1 + S2. All these prove the high quality of the organic matters while kerogen is dominated by Type Ⅰ and Type Ⅱ, with 50% and 43% respectively under the microscope. The study of the source rock e-volution by various indexes demonstrates that the lower part of upper Es4 has come into the peak time of hydrocarbon genera-tion,and upper part of the upper Es4 is coming into maturity. In contrast,lower Es3 is low in maturity. Estimated resources by basin modeling show that the resource potential of upper Es4 is 1.027 6FFXX108t.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2007年第1期40-43,共4页
Petroleum Geology and Recovery Efficiency
