民和盆地窑街煤田油页岩沉积环境分析及开发前景预测

Sedimentary environmental analysis and exploration perspective forecasting of oil shale in Yaojie Coal Field,Minhe Basin

通过岩芯钻井资料的综合分析,对民和盆地窑街煤田油页岩沉积特征、层序地层、古地理演化和成矿规律进行了研究。结果表明,油页岩段主要为水进体系域和高水位体系域发育时期,油页岩主要形成于沼泽和浅湖-半深湖相的沉积环境中。其中油四层油页岩品质较好,平均含油率>8%,属于湖泊沼泽相,具有良好的工业品位。研究区油页岩具有中含油率高灰分的特征,资源总储量为2.3×108t,具有良好的开发前景。

By analyzing the data of drilling core, the authors studied the depositional features, sequence stratigraphy, paleogeographic evalution, and metaUogeny regularity of oil shale from the Yaojie Coal Field in Minhe basin of Gansu. The oil shale is developed in the phase of transgressive- and high stand system tracts. The depositional environments of oil shale change from shallow Iake facies to semi-deep Iake facies. The oil shale of the fourth bed possessing great commercial value with average oil content over 8%, is deposited in lacustrine-swamp facies. The characteristics of oil shale in this area are middle in oil content but high in ashcontent reserves are 2.3 × 10^8 t, which implies a good exploration prospect.