川南-黔北地区下志留统龙马溪组泥页岩发育特征研究

Study on Development Characteristics of Shale in Lower Silurian Longmaxi Formation in Southern Sichuan and Northern Guizhou Region

通过大量野外剖面测量及钻井曲线分析,对川南-黔北地区志留系下统龙马溪组地层发育特征及沉积环境进行研究,认为龙马溪组地层及其中的炭质页岩发育受沉积古地貌控制明显,呈东-西向条带状展布,自南向北逐渐变厚,最厚达104 m。在龙马溪组陆棚沉积中按水体深浅划分了深水陆棚和浅水陆棚2个亚相,按物质组成差异,识别出了泥质粉砂棚、灰质粉砂质泥棚,粉砂质炭质泥棚和炭质泥棚。泸州-赤水和南川-彭水2个区域为炭质泥棚沉积,炭质泥岩发育较好,有机质含量丰富,是下一步勘探的重点区域。

Through analysis of lots of field profile measurement and drilling curve, do the study of stratigraphic development characteristies and sedimentary environment in Lower Silurian Longmaxi formation in southern Sichuan northern Guizhou region. The results show that Longmaxi strata and it＇s carbonaceous shale obviodsly controlled by sedimentary palaeogeomorphology, the distribution is eastwest strip, from south to north, the thickness of the north is thick, the thickness is 104 m. In Longmaxi shelf deposits, divided by the depth of water, it can divided into two subfacies： deep water shelf and shallow water shelf. The development of Longmaxi formation is very well in Luzhou-Chishui and Nanchuan-Pengshui which are carbonaceous mud shed area, and organic matter content id rich, it will be the key area for further exploration.