| 河套盆地临河坳陷下白垩统内部不整合的发现及对构造演化的启示 |
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| 引用本文： | 刘天顺,张锐锋,丁文龙,焦保程,王少春,吴晨林,杜晓宇,周志成,薛明旺.河套盆地临河坳陷下白垩统内部不整合的发现及对构造演化的启示[J].中国地质,2021,48(2):593-604. |
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| 作者姓名： | 刘天顺 张锐锋 丁文龙 焦保程 王少春 吴晨林 杜晓宇 周志成 薛明旺 |
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| 作者单位： | 中国地质大学 能源学院, 北京 100083;非常规天然气地质评价与开发北京市重点实验室, 中国地质大学, 北京 100083;自然资源部页岩气资源战略评价重点实验室, 中国地质大学, 北京 100083;中国石油华北油田分公司, 河北 任丘 062552 |
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| 基金项目： | 国家自然科学基金项目（41372139）和国家科技重大专项专题（2016ZX05046-003-001、2016ZX05033-002-004、2016ZX05033-002-005、2016ZX05034-004-003）联合资助。 |
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| 摘 要： | 河套盆地临河坳陷是一个NE-SW向展布的中—新生代的弧形走滑拉分盆地。依据地层古生物微体化石组合特征、不整合体的测井响应特征（包括声波时差法确定不整合面）、不整合面的地震响应特征等方法综合研究，发现了下白垩统内部不整合。不整合面之上发育固阳组，之下发育乌尔塔组。固阳组全盆普遍发育，地层厚度差异不大。乌尔塔组主要分布在靠近狼山断裂附近的两个小凹陷内，地层厚度整体由西北向东南递减。地震资料的时深转换结果显示：南部小凹陷地层厚度大于北部小凹陷，在南部最厚处约800 m，北部最厚处约600 m。乌尔塔组沉积后，盆地受中燕山运动的影响，受到NW-SE向挤压应力，由于挤压作用差异抬升，地层遭受剥蚀，形成下白垩统内部不整合。该不整合具备从西北往东南由平行不整合逐渐转变为角度不整合的特征。结合不整合的成因特征和地层厚度变化，将早白垩世盆地的构造演化分为早白垩世早期断陷阶段、早白垩世中期挤压抬升剥蚀阶段、早白垩世晚期弱伸展坳陷阶段。
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| 关 键 词： | 临河坳陷 下白垩统 不整合 测井响应特征 地震响应特征 油气勘查工程 |
| 收稿时间： | 2019/12/29 0:00:00 |
| 修稿时间： | 2020/3/12 0:00:00 |
Discovery of Lower Cretaceous unconformity in Linhe Depression of Hetao Basin and its implication to structural evolution |
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| LIU Tianshun,ZHANG Ruifeng,DING Wenlong,JIAO Baocheng,WANG Shaochun,WU Chenlin,DU Xiaoyu,ZHOU Zhicheng,XUE Mingwang.Discovery of Lower Cretaceous unconformity in Linhe Depression of Hetao Basin and its implication to structural evolution[J].Chinese Geology,2021,48(2):593-604. |
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| Authors: | LIU Tianshun ZHANG Ruifeng DING Wenlong JIAO Baocheng WANG Shaochun WU Chenlin DU Xiaoyu ZHOU Zhicheng XUE Mingwang |
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| Institution: | School of Energy Resources, China University of Geosciences, Beijing 100083, China;Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development, China University of Geosciences, Beijing 100083, China;Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Natural Resources of the People''s Republic of China, China University of Geosciences, Beijing 100083, China;PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China |
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| Abstract: | The Linhe Depression of Hetao Basin is a NE-SW trending Meso-Cenozoic arc-shaped strike-slip pull basin. Based on the combination of microfauna fossils, logging response characteristics (including the method of acoustic wave time difference to determine unconformity) and seismic response characteristics of unconformity, an unconformity within the Lower Cretaceous was identified. The unconformity is distinguished by the overlying Guyang Formation and underlying Urta Formation. The former is generally developed throughout the basin, and its thickness does not change much, and the latter with thickness decreasing from northwest to southeast as a whole is mainly distributed in two small sags close to the Langshan fault. The time and depth conversion results of the seismic data show that the thickness of the Urta Formation in the south is greater than that in the north. The thickest formation in the south is about 800 meters, and the thickest formation in the north is about 600 meters. After the deposition of the Urta Formation, the basin was affected by the Middle Yanshan Movement and subjected to the northwest-southeast compression. Due to the squeezing effect, the strata were uplifted and suffered erosion, resulting in the internal unconformity within the Lower Cretaceous. The unconformity is characterized by gradually changing from parallel unconformity to angular unconformity from northwest to southeast. Combined with the causes of the unconformity and the change of the thickness of the strata, the structural evolution of the basin in the early Cretaceous can be divided into three stages:the fault depression stage in the early Early Cretaceous, the uplift and erosion stage in the middle Early Cretaceous and the weak extension depression stage in the late Early Cretaceous. |
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| Keywords: | Linhe depression Lower Cretaceous unconformity logging response seismic responses hydrocarbon accumulation oil and gas exploration engineering |
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