| 四川盆地磨溪—高石梯地区加里东—海西期龙王庙组构造古地貌恢复及地质意义 |
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| 引用本文： | 金民东,谭秀成,曾伟,李凌,李宗银,罗冰,张静蕾,洪海涛.四川盆地磨溪—高石梯地区加里东—海西期龙王庙组构造古地貌恢复及地质意义[J].沉积学报,2016,34(4):634-644. |
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| 作者姓名： | 金民东 谭秀成 曾伟 李凌 李宗银 罗冰 张静蕾 洪海涛 |
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| 作者单位： | 1.四川省天然气地质重点实验室 西南石油大学 成都 610500; |
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| 基金项目： | 国家科技重大专项(2011ZX05004-005-03)，国家自然科学基金项目(41402126)，China National Science and Technology Major Project |
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| 摘 要： | 本文基于磨溪-高石梯地区三维地震和钻孔资料，选择地震层位易于追踪的二叠底-龙王庙底厚度变化趋势来表征龙王庙组底界构造古地貌。分析发现高台组沉积是对龙王庙末期的填平补齐，而二叠底-龙王庙底厚度与高台组地层厚度具明显的正相关关系，因而恢复的龙王庙组底界构造古地貌可以近似代表高台组沉积前的龙王庙组沉积古地貌；同时，该古地貌高地南缘的相对低地是龙王庙组颗粒滩最发育的地区，表明龙王庙沉积期古地貌特征具有类似特征。进一步分析发现认为:在加里东-海西期，经侵蚀窗补给的岩溶水顺层流动的活动规律受控于该古地貌，古地貌对岩溶储层的差异发育和质量变化具有明显的控制作用，即在古地貌斜坡带和岩溶水汇聚的沟谷地带，岩溶改造作用最强，所形成的储层质量最好；在孤立古地貌高地，岩溶改造作用相对较弱，所形成的岩溶型储层质量相对变差。结果表明该古地貌是龙王庙期沉积古地貌长期继承性发展的结果，其对沉积、储层的控制作用也为后期新钻井和开发井所验证。该研究方法和思路可供相似地质背景的同类工作对比参考。
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| 关 键 词： | 构造古地貌 沉积古地貌 龙王庙组 磨溪-高石梯 四川盆地 |
| 收稿时间： | 2015-03-07 |
Reconstruction of the Tectonic Palaeogeomorphology of Longwangmiao Formation during the Caledonian-Hercynian Period in Moxi-Gaoshiti Area,Sichuan Basin and Its Geological Significance |
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| Institution: | 1.Key Laboratory of Natural Gas Geology, Southwest Petroleum University, Chengdu 610500, China;2.The Sedimentary and Accumulation Department of Key Laboratory of Carbonate Reservoirs, PetroChina, South west Petroleum University, Chengdu 610500, China;3.Exploration Division of PetroChina Southwest Oil and Gas Field Company, Chengdu 610501, China;4.Research Institute of Petroleum Exploration and Development, Southwest Oil and Gas Field Company PetroChina, Chengdu 610501, China |
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| Abstract: | Based on 3-D seismic material and drill-hole data in Moxi-Gaoshiti area, the variation trend of the thickness from the bottom of Longwangmiao to the bottom of Permian was chosen to represent the tectonic palaeogeomorphology of the lower bottom of Longwangmiao Formation. Since the analysis found that the deposition of the overlying Gaotai Formation could fill and level up the Longwangmiao Formation at the end of Longwangmiao sedimentation, and there is a positive correlation between the thickness from the bottom of Longwangmiao to the bottom of Permian and the thickness of Gaotai Formation, the tectonic palaeogeomorphology of the lower bottom of Longwangmiao Formation could represent the Longwangmiao sedimentary palaeogeomorphology before the deposition of Gaotai Formation approximately. Meanwhile, the relatively low position at the southern margin of the palaeogeomorphology highland was the area where the grain beach of Longwangmiao Formation was most developed, it suggested that the palaeogeomorphology during the Longwangmiao sedimentation was similar to this palaeogeomorphology. After further analysis, we believe that palaeogeomorphology controlled the activity routines of the bedding flowing karst water which was supplied by the erosion window during the Caledonian-Hercynian period, and then determined the differences in development and quality change of the karst reservoirs:in the slope belt and the ravine area where the karst water converge, the karst reformation is the strongest, the reservoirs formed here are the best; in the isolated highlands, the reformation is relatively weak, and the reservoir quality is poor. The results show that this palaeogeomorphology was the result of inheritance developing of sedimentary palaeogeomorpholog during Longwangmiao depositon, and the newly drilled wells and development wells have proven its controlling action on sedimentation and reservoirs. This method and thought is helpful and referential for the same genre in similar geological background. |
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| Keywords: | tectonic palaeogeomorphology sedimentary palaeogeomorphology Longwangmiao Formation Sichuan Basin Moxi-Gaoshiti area |
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