| 柴达木盆地西北区地层剥蚀厚度恢复及对油气成藏的启示 |
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| 引用本文： | 冯德浩,刘成林,田继先,太万雪,李培,曾旭,孔骅.柴达木盆地西北区地层剥蚀厚度恢复及对油气成藏的启示[J].石油实验地质,2022,44(1):188-198. |
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| 作者姓名： | 冯德浩 刘成林 田继先 太万雪 李培 曾旭 孔骅 |
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| 作者单位： | 1. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249; |
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| 基金项目： | 国家自然科学基金面上项目(41872127);中国石油天然气股份有限公司科技重大专项(2016E-0102)联合资助。 |
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| 摘 要： | 柴达木盆地西北至一里坪地区面积大、油气资源探明程度低，恢复地层剥蚀厚度对油气资源评价具有重要意义。针对剥蚀厚度恢复的复杂性和恢复结果的不确定性，采用地层趋势延伸法、声波时差法、镜质体反射率法和Easy%Ro最优化法等多种方法相结合，计算了研究区晚期构造运动地层剥蚀厚度，并定量探讨了其对油气成藏的影响。研究区第四系和上新统狮子沟组（N23）普遍遭受剥蚀，局部构造顶部剥蚀量可达1 000 m，上油砂山组（N22）在油泉子等部分构造顶部遭受剥蚀，下油砂山组（N21）仅在盆地周缘被剥蚀。英雄岭构造带、各构造顶部以及阿尔金山前是剥蚀严重的区域，剥蚀量普遍超过500 m；洼陷地带以及研究区东部剥蚀量较小，剥蚀厚度小于500 m，构造活动相对稳定。油气藏和地面油气显示分布与地层剥蚀密切相关，适宜强度的地层剥蚀（300 m＜剥蚀量＜1 500 m）有利于形成油气藏，而剥蚀厚度超过1 500 m则易造成油气藏的破坏。
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| 关 键 词： | 地层剥蚀厚度 地层恢复 晚期构造运动 油气成藏 一里坪地区 柴达木盆地西北部 |
| 收稿时间： | 2020-08-18 |
Erosion thickness recovery and its significance to hydrocarbon accumulation in northwestern Qaidam Basin |
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| FENG Dehao,LIU Chenglin,TIAN Jixian,TAI Wanxue,LI Pei,ZENG Xu,KONG Hua.Erosion thickness recovery and its significance to hydrocarbon accumulation in northwestern Qaidam Basin[J].Petroleum Geology & Experiment,2022,44(1):188-198. |
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| Authors: | FENG Dehao LIU Chenglin TIAN Jixian TAI Wanxue LI Pei ZENG Xu KONG Hua |
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| Affiliation: | 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China;3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China |
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| Abstract: | The area from the northwestern Qaidam Basin to Yiliping is large and the exploration degree of proved petroleum reserves is low. It is of great significance for future petroleum resource assessment to recover the thickness of eroded formation. In this paper, several methods including stratigraphic trend extension, interval transit time, vitrinite reflectivity and Easy%Ro optimization were used to calculate the formation erosion thickness during the late tectonic movement in the study area, and its significance for hydrocarbon accumulation was quantitatively discussed. The Quaternary and Pliocene Shizigou Formation (N23) in the study area were generally eroded, with a maximum erosion thickness of about 1 000 m on the top of some local structures. The Upper Youshashan Formation (N22) was eroded on the top of some structures such as Youquanzi, and the Lower Youshashan Formation (N21) was eroded only at the periphery of the basin. The Yingxiongling structural belt, the top of each structure and the Altun foreland are the areas experienced the most serious erosion, generally more than 500 m of thickness. The erosion thickness in the depression and the eastern part of the study area is relatively smaller, usually less than 500 m, and the tectonic activities here are relatively stable. The distribution of petroleum reservoirs and hydrocarbon shows are closely related to the erosion thickness of sedimentary strata. The erosion thickness with appropriate strength (300-1 500 m) is conducive to the formation of oil and gas reservoirs, while an erosion thickness over 1 500 m is easy to cause damage to oil and gas reservoirs. |
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| Keywords: | strata erosion thickness stratigraphic restoration late tectonic movement hydrocarbon accumulation Yiliping area northwestern Qaidam Basin |
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