Carboniferous source rocks in the Ludong-Wucaiwan area, Junggar Basin, NW China

Natural gas in the Ludong-Wucaiwan area is characterized by typical source-controlled reservoirs. Combining outcrop data, well data and seismic data, this article makes a systematic research and evaluation on the abundance, type, and maturity characteristics of the Carboniferous source rocks in the Ludong-Wucaiwan area. The Carboniferous source rocks are dominantly dark grey and grey mudstones, secondarily tuffs, carbonaceous mudstones, silty mudstones and coals. The source rock abundance of the Upper Carboniferous Batamayineishan Formation (C2b) is higher than that of the Lower Carboniferous Dishuiquan Formation (C1d), while the kerogen type of the Lower Carboniferous source rock is better than that of the Upper Carboniferous. The maturity center of the Carboniferous source rocks is located in the west part of Dinan uplift to the Wucaiwan depression area, with maturity decreased towards south and north. The distributions of the Carboniferous source rocks and volcanic rocks are complementary. The source rocks are distributed in zonal shape in east-west direction, and are most developed in the west part of the Dinan uplift and its southern area. 摘要: ： 陆东—五彩湾地区天然气具有典型的源控成藏特征，将露头资料、钻井资料和地震资料相结合，对陆东—五彩湾地区石炭系烃源岩的丰度、类型、成熟度特征进行了系统研究和评价。研究区石炭系烃源岩以深灰色泥岩和灰色泥岩为主，其次为凝灰岩、炭质泥岩、粉砂质泥岩和煤；上石炭统巴塔玛依内山组（C2b）烃源岩丰度高于下石炭统滴水泉组（C1d），下石炭统烃源岩的类型好于上石炭统；石炭系烃源岩成熟度高值区分布在滴南凸起西段—五彩湾凹陷一带，向南、北方向石炭系烃源岩的成熟度降低；石炭系烃源岩与火山岩的分布具有互补性，烃源岩呈东西向带状分布，烃源岩最发育区位于滴南凸起西段及其南部。图8表2参15 Key words: Ludong-Wucaiwan, Carboniferous, source rock characteristics, source rock distributio