增生楔盆地烃源岩特征综合评价——以缅甸某区块为例

Source rock evaluation of accretionary wedge basin: A case study of a block in Myanmar

从缅甸某区块已钻井和手工顿钻井的有机质丰度、类型及热演化分析,该区具有一定的生烃能力。基于钻井的有机碳(TOC)、热解生烃潜力(S_2)、氯仿沥青"A"、总烃(HC)、镜质体反射率(R_o)等测试化验,对研究区的两套主要烃源岩——始新统和中新统的泥、页岩进行评价,认为主力烃源岩为中—下始新统,上始新统—中中新统组为低—中等丰度烃源岩;有机质类型主要为Ⅱ_2-Ⅲ型,南部生气、北部生油;有机质热演化达到低熟—成熟阶段,南部热演化程度高于北部。综合分析认为研究区具有较好的烃源潜力。

Based on an analysis of the abundance,type and thermal evolution of the organic matter from wells and cable drilling data of a block in Myanmar,the authors have revealed that the study area has certain hydrocarbon generating potential. The evaluation of 2source rocks of the Oligocene and Miocene shale by using TOC,S_2,chloroform asphalt ＂ A＂,Tmax and R_otest data shows that the main source rock is Lower-Middle Oligocene,whereas middle-upper layer of Oligocene has low-middle organic abundance source rock.The type of organic matter is Ⅱ_2or Ⅲ,gas is produced in the south and oil is produced in the north. Thermal evolution in the south is higher than that in the north,and the maturity is in low-mature and early stage. It is concluded that the study area has a good hydrocarbon potential.