川南自201井区奥陶系-志留系间黑色页岩生物地层  

BIOSTRATIGRAPHY OF ORDOVICIAN-SILURIAN BLACK SHALE AT WELL ZI 201, SOUTH SICHUAN

作　　者：王红岩[1,2] 郭伟 梁峰[1,2] 赵群 WANG Hong-yan;GUO Wei;LIANG Feng;ZHAO Qun(Langfang Branch,Research Institute of Petroleum Exploration and Development,Petrochin;Langfang 06500;National Energy Shale Gas Research ＆ Development Center,Langfang 06500)

机构地区：[1]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [2]国家能源页岩气研发(实验)中心,河北廊坊065007

出　　处：《地层学杂志》2018年第4期455-460,共6页Journal of Stratigraphy

基　　金：国家重点基础研究发展计划(973)项目"中国南方海相页岩气高效开发的基础研究"(2013CB228000);国家"十三五"重大专项"四川盆地及周缘页岩气形成富集条件;选区评价技术与应用(2017ZX05035)资助

摘　　要：我国南方海相页岩气资源潜力巨大,勘探开发活跃,目前已经在四川威远、长宁和重庆焦石坝等地区取得重大进展,但这些地区在优质页岩的时空展布和产能效果方面存在较大差异。自201井位于四川盆地南部,其中发育了上奥陶统五峰组—下志留统龙马溪组的黑色笔石页岩序列,根据其中赋存的笔石和腕足动物生物化石,并结合区域地层特征,可将其划分为9个生物带,包括8个笔石带和一个壳相生物带,其优质页岩厚度超过15m。通过与邻近的自202井的对比分析,可发现该地区的地层发育情况差异明显,向东南方向地层出现缺失并导致优质页岩厚度变薄,因此可预测该区存在水下古隆起,从而对该区优质页岩分布造成较大影响。Marine shale gas resources of southern China have great potential in the petroleum industry. The exploration and development of shale gas has recently made significant progress in the Weiyuan and Changning areas of southern Sichuan basin, as well as in the Jiaoshiba area of Chongqing. However, there are major dif- ferences in the lateral distribution of high quality shale and the productivity of shale gas. The well Zi 201 lies southwest to the Weiyuan area in southern Sichuan basin. A systematic biostratigraphic study based on grapto- lites and brachiopods reveals eight graptolite biozones and one shelly fossil assemblage in the Wufeng and Lungmachi formations. The thickness of high quality shale at well Zi 201 is more than 15 meters thick. Through the correlation with the adjacent well Zi 202, we found the stratigraphic framework changed greatly in this area, with a significant hiatus in the base of the Lungmachi Formation in the southeast and a southeastward thinning of the high-quality shale. This indicates the existence of a submarine palaeo-uplift, which effected the shale distribution in the study area.

关 键 词：生物地层 页岩气 笔石 腕足动物 水下古隆起 奥陶系 志留系 荣县 四川 

分 类 号：P534.42[天文地球—古生物学与地层学] P534.43[天文地球—地质学]