地质通报2016，Vol.35Issue(2)：406-414,9.
鄂尔多斯盆地三叠系延长组长7段浊积扇对油气聚集的控制
Turbidite fan and its controlling effects on hydrocarbon ac- cumulation in the Chang 7 Member of Triassic Yanchang Formation in Ordos Basin
摘要
Abstract
The sedimentary environment of the Chang 7 Member of Triassic Yanchang Formation in Ordos Basin is lacustrine facies with the background of large area mudstone deposition in the deep lake. The turbidity current deposits are widespread, and are char⁃acterized by extensive sedimentary range, large thickness, and proximal hydrocarbon source rocks. With these favorable factors, the Chang 7 Member has become the advantageous reservoir of oil. It is therefore necessary to find out the characteristics of sedimentary facies of the turbidite fan and sand bodies formed from different microfacies which affected the oil accumulation. Based on the analysis of the field outcrop and the core statistics, the authors divided turbidite fan microfacies in detail, which helps to study the turbidite for⁃mation, distribution, and sedimentary characteristics. According to previous research results, the channel turbidite fan with fixed sup⁃ ply and the channel turbidite fan with no fixed feeder were named respectively slope moving turbidite fan and slumping turbidite fan. On the basis of differences in thickness of single sand, turbidite types and formation locations, the authors divided the slope moving turbidite fan into three subfacies, i.e., upper fan, middle fan and the edge of the fan. The three subfacies contain six microfacies, such as the main channel and the overflow deposits. The slumping turbidite fan facies was divided into two subfacies, i.e., central fan and marginal fan. The recognition of microfacies of the turbidite fan and the study of their formation can help the log work to identify fa⁃vorable sand body, distinguish different oil and gas reservoirs, and control the distribution of oil and gas. Massive texture sand body⁃and layers sand body help to find the favorable oil and gas reservoir.关键词
浊积扇/鄂尔多斯盆地/坡移浊积扇/滑塌浊积扇/油气聚集Key words
turbidite fan/Ordos Basin/slope moving turbidite fan/slump turbidite fan/oil and gas accumulation分类
地质学引用本文复制引用
石玉江,李文厚,王长胜,张小莉,张少华,宋平..鄂尔多斯盆地三叠系延长组长7段浊积扇对油气聚集的控制[J].地质通报,2016,35(2):406-414,9.基金项目
国家自然科学基金项目（批准号41330315）和中国地质调查局项目 （）
