中国南方海相页岩吸附特征及其影响因素

我国南方古生界主要发育下寒武统、下志留统富含有机质的暗色海相泥页岩，是我国页岩气勘探的首要战略选区。我国南方古生界页岩成熟度高，大部分地区埋藏较深，经历了复杂的构造热演化作用，地层抬升对页岩含气性产生了直接影响，尤其对页岩吸附能力和含气饱和度有着重要的影响。为此，选取中国南方海相下志留统龙马溪组页岩样品进行了页岩吸附能力测试，利用实验结果开展了不同温度条件下页岩吸附能力的对比和构造抬升对吸附能力的影响分析。结果认为：温度、总有机碳含量是影响页岩吸附能力的关键因素；构造抬升作用强度对页岩含气性具有重要的影响，进而影响到页岩气的富集成藏。该成果可用于指导正在进行的中国页岩气地质选区工作。

Adsorptivity and influential factors of marine shales in South China

Organic-rich dark marine shales are well developed in the Cambrian and Lower Jurassic formations in South China and they are the primary plays for shale gas exploration in China.The Paleozoic shales in South China are featured by high maturity,great burial depth,and complex structural and thermal evolution history.Uplifting directly influenced the gas-bearing capacity of the shales,especially their adsorptivity and gas saturation.The marine shale samples from the Lower Jurassic Longmaxi Formation in South China were used to test shale adsorptivity.According to the test results,we performed a comparative study of shale adsorptivity at different temperatures and analyzed the influences of uplifting on the adsorptivity.The following conclusions were drawn.Temperature and TOC are the major factors influencing the shale adsorptivity.Uplifting has a significant impact on gas-bearing capacity of shales,thus further influences the enrichment of shale gas.These understandings can be used to guide geologic exploration of shale gas in China.