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百色盆地东部坳陷古近系那读组的那一段上亚段和下亚段以及那二段广泛发育厚度很大的暗色泥岩 ,累计厚度可达 2 0 0～ 10 0 0m。在东部坳陷的绝大部分地区三段地层暗色泥岩的有机碳含量都在 1 0 %以上 ,是好的烃源岩。三套高效源岩的干酪根均以ⅡA型为主 ,次为ⅡB型和Ⅲ型 ,干酪根类型分布受控于沉积环境。那一段泥岩的Ro 值为 0 4 %～ 0 6 5 % ,处于未成熟—低成熟阶段 ;那二段在较深部位的Ro 值为 0 7%～ 0 8%或更高 ,处于成熟阶段的早期。该坳陷的暗色泥岩厚度高值区、半深湖区、有机碳含量高值区、Ro 高值区是一致的 ;沉积中心、沉降中心与生烃中心吻合。那二段成熟度相对较高 ,已达到成熟阶段早期 ,源岩厚度、沉积环境、有机质丰度和类型等也比较有利 ,因此 ,那二段应是本区的最主要的高效烃源岩。田东沉积区面积较大、泥岩厚度较大、半深湖区范围较大、有机碳含量较高、有机质类型较好、有机质的成熟度也相对较高 ,因此 ,田东沉积区比田阳沉积区更具有生、排烃的潜力。
The upper and lower subfacies of the Paleogene Paleogene in the eastern depression of the Baise basin, as well as the dark mudstone with large thickness developed extensively in the second member of the Baise Basin, have accumulated thicknesses of up to 200 ~ 10 000 m. The organic carbon content of the dark mudstones in the three sections of the eastern depression is above 10%, which is a good source rock. The kerogen of the three sets of high-efficiency source rocks are mainly type IIA, followed by type IIB and type III. The distribution of kerogen type is controlled by sedimentary environment. In that period, the Ro value of mudstone was 0 4% ~ 0 6 5%, which was in the immature-low maturity stage. The Ro value of that section was 0 7% ~ 0 8% or more in the deeper part, Early. The dark mudstone thickness, semi-deep lake area, high organic carbon content area and high Ro value area are consistent in this depression. The sedimentary center and sedimentation center coincide with the hydrocarbon generation center. The maturity of the second stage is relatively high and has reached the early stage of maturity. Source rock thickness, sedimentary environment, abundance and type of organic matter are also favorable. Therefore, the second stage should be the most important source rock of high efficiency in this area. Tiandong sedimentary area is larger, mudstone thickness is larger, semi-deep lake area is larger, organic carbon content is higher, organic matter type is better, and organic matter maturity is relatively high. Therefore, More raw, hydrocarbon potential.