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标题：IDENTIFICATION OF THE FATE TRIASSIC CHANG 63 PERIOD SFOPE BEFT IN THE CENTRAF ORDOS BASIN AND OIF AND GAS GEOFOGICAF SIGNIFICANCE
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作者：Jianbo Liao ; Aihua Xi ; Zhiyong Li 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2020
卷号：29
期号：4A
页码：2932-2941
语种：English
出版社：PSP Publishing
摘要：The Mesozoic lake basin in the Ordos Basin has a stable Craton basement, and the sedimentary bottom is flat. Most of the areas are delta-Huxiang sedimentary strata. However, in the middle part of the lake basin, the upper 7 upper strata can be seen to be truncated. The distribution of the Chang 6 stratum is obviously controlled by the slope break zone, and the reflection inside is characterized by lenticular or wedge shape. Through the later exploration practice, hundreds of millions of tons of petroleum resources were found in the Chang 6 stratum of the lake facies in the Huaqing area in the middle of the lake basin. The reservoir is a gravity flow composite sand body controlled by a slope break zone. Therefore, identifying the cause of this type of slope break zone and the plane distribution position of the slope break zone in this area are very important for the subsequent exploration direction and development capacity deployment. On the basis of a large amount of physical workload, the authors use the combination of well and earthquake data to determine the sedimentary paleo environment. The Chang 6 -stage sedimentary slope is located in the line of Yuan 281- Bai136-Bai163-Bai230-Bai265, and the upper part of the slope is the northern Shaanxi delta. The southward extension of the group is favorable for sedimentary microfacies as the delta front subaqueous distributary channel and estuary dam deposit. The deep water gravity flow developed in the south is deposited as multiple sandy debris flow tongues. It is pointed out that the favorable exploration and development direction above the slope will be traced to the main body belt of the diversion channel. Below the slope, the sand debris flow sand body should be traced to the lake center.
关键词：Deep water sedimentation slope;phase differentiation;reservoir characteristics;enrichment law;Ordos Basin