鄂尔多斯盆地西缘马家滩地区石盒子组砂岩的岩石学、地球化学与成岩作用特征

鄂尔多斯盆地马家滩地区石盒子组是天然气的重点勘探层位。对马家滩地区石盒子组的岩石学特征和成岩作用研究表明，石盒子组的储层岩石类型主要为石英砂岩、岩屑石英砂岩，少量的长石岩屑砂岩。储层砂岩的成岩作用类型主要有压实和压溶、石英次生加大、胶结、溶解。根据成岩作用特征，建立了研究区储层砂岩的成岩共生序列: 自生伊利石--自生绿泥石--石英次生加大--高岭石--方解石。鄂尔多斯盆地作为中国CO2 地下埋藏的潜在目标区，开展CO2 可能埋藏层段的岩石学特征和成岩作用研究，可为CO2 地质储存的数值模拟研究提供岩石学信息。

Sandstone petrology, geochemistry and diagenetic features of Shihezi Formation in Majiatan area, western Erdos Basin

The Shihezi Formation is the focus point of natural exploration gas layer in Majiatan area of Ordos Basin． The research on rock characteristics and diagenesis of Shihezi Formation in the Majiatan area indicates that the stone box set of reservoir rock types are mainly quartz sandstone，lithic quartz sandstone and small amounts of feldspar-lithic sandstone． The main type of reservoir sandstone diagenetic are compaction and pressure solutionquartz overgrowth-cementation-dissolution． According to the characteristics of diagenesis and sandstone reservoir，a symbiosis of diagenetic sequence is established: authigenic illite-authigenic chlorite-quartz overgrowth-kaolinite-calcite． Ordos Basin is a CO2 buried potential target area in China． The petrological saudy on the diagenesis and buried layer section may provide information for numerical simulation of CO2geological research．