Control actions of sedimentary environments and sedimentation rates on lacustrine oil shale distribution, an example of the oil shale in the Upper Triassic Yanchang Formation, southeastern Ordos Basin (NW China)

摘要

Oil shale is an important form of unconventional resources. It is significant to determine the control factors on oil shale distribution. Abundant oil shale resources are hosted in the Member Chang 7-3 (Ch7-3), Triassic Yanchang Formation in southeastern Ordos Basin (NW China). This study was conducted to investigate the sedimentary environment, distribution and organic matter source of the Ch7-3 Oil shale by a combined study of outcrops, core data, organic and element geochemical indices. The controlling factors of the oil shale distribution were determined by an analysis of sedimentary environments and geochemical features of the oil shale.