中国地质2009，Vol.36Issue(5)：1055-1064,10.
川东南地区飞仙关组层序岩相古地理特征
Sequence-based lithofacies and paleogeography of Lower Triassic Feixianguan Formation in southeastern Sichuan Basin
摘要
Abstract
Guided by the sequence stratigraphy and sedimentology and aimed at oil-gas exploration, the authors recognized two third-order sequences (SQ1, SQ2) in the Feixianguan Formation, both of which belong to the type II sequence. Sequence-based lithofacies and paleogeographic maps of Feixianguan Formation were compiled by means of condensation and instantaneity with mapping units of sedimentary system tracts. The result shows that, from the phase of SQ1TST to that of SQ2LHST, the deposition evolution changed from the mixing shelf facies to the platform fades. That is to say, during the phase of SQ1TST, the mixing shelf constituted the setting of the study area due to the rising of the sea level. During the phase of SQ1HST, based on previous deposition, the depth of the basin water gradually turned shallow and the environment changed form the mixing shelf to the open platform; at that time, the oolite beach was developed. During the phases of SQ2TST and SQ2EHST, the setting of the study area didn't change, but the oolite beaches experienced something unusual. During the phase of SQ2EHST, the number and the sizes of the oolite beaches became optimal. During the phase of SQ2LHST, however, the relative falling of the sea level and the deposition of the sediments resulted in the change of the environment of the study area from the open platform to the restricted platform, with the sedimentary rocks being mainly limestone, dolomite and gypsum rocks. It is thus concluded that the oolite beaches were mainly developed during the phase of SQ2EHST, and these beaches hence deserve much attention in future exploration.关键词
层序岩相古地理/鲕滩/飞仙关组/下三叠统/川东南Key words
sequence-based lithofacies and paleogeography/ oolite beach/ Feixianguan Formation/ Lower Triassic/ southeastern Sichuan Basin分类
天文与地球科学引用本文复制引用
徐胜林,陈洪德,林良彪,陈安清..川东南地区飞仙关组层序岩相古地理特征[J].中国地质,2009,36(5):1055-1064,10.基金项目
国家自然科学基金重点项目(40739901)及SGC-CDVT复杂油气藏地球物理联合研究所资助. （40739901）
