| 银额盆地哈日凹陷多类型油气藏共生特征及其成藏机理 |
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| 引用本文： | 陈治军,王文慧,刘金丰,白晓寅,王小多,李科社,李子梁.银额盆地哈日凹陷多类型油气藏共生特征及其成藏机理[J].沉积学报,2022,40(2):557-572. |
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| 作者姓名： | 陈治军 王文慧 刘金丰 白晓寅 王小多 李科社 李子梁 |
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| 作者单位： | 1.陕西延长石油(集团)有限责任公司研究院, 西安 710075 |
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| 基金项目： | 自然资源部项目;延长石油集团科技攻关项目 |
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| 摘 要： | 近年来，银根—额济纳旗盆地哈日凹陷发现了多种类型油气藏，证实其有较好的油气勘探前景，但该凹陷油气地质条件极为复杂，特别是对多类型油气藏的共生特征及其成藏机理认识不足，限制了对油气分布规律的科学预测，制约了油气勘探的进程。基于对各类型油气藏的剖析，探讨多类型油气藏共生特征及其成藏机理，预测油气分布，分析勘探方向，以期为该区的勘探决策和勘探部署提供依据。研究表明，哈日凹陷白垩系发育白云质泥岩生物气藏、灰质泥岩气藏、灰质泥岩油藏、砂岩油藏、砂岩气藏、火山岩气藏等多种类型油气藏，他们以银根组、巴音戈壁组二段和巴音戈壁组一段烃源岩为主力烃源岩，具有“近源成藏”和“源内成藏”的特征。油气藏呈现“油藏与气藏共存、常规与非常规油气共生、构造与岩性油气藏均有发现”的特征。油气成藏机理研究表明，缺乏有效的油气运移通道是导致油气藏具有“近源成藏、源内成藏”的主要原因，凹陷不同构造位置主力烃源岩热演化程度的差异使得油气具有“浅油深气”的分布特征，多类型有效储层的发育造就“多类型油气藏共生”的局面。预测出研究区各类油气藏的累计含油气面积381 km2，指出灰质泥岩气藏作为提交储量的现实领域为下步勘探的主攻方向、砂岩油藏作为扩大勘探成果的潜在领域为下步勘探的次要方向、火山岩气藏和灰质泥岩油藏作为多类型油气藏联合勘探的有益补充为下步勘探的兼顾方向。
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| 关 键 词： | 勘探方向 哈日凹陷 油气成藏机理 油气藏类型 银额盆地 |
| 收稿时间： | 2020-10-09 |
Symbiotic Characteristics and Hydrocarbon Accumulation Mechanism of Multi-type Oil and Gas Reservoirs in the Hari Sag,Yingen-Ejinaqi Basin |
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| CHEN ZhiJun,WANG WenHui,LIU JinFeng,BAI XiaoYin,WANG XiaoDuo,LI KeShe,LI ZiLiang.Symbiotic Characteristics and Hydrocarbon Accumulation Mechanism of Multi-type Oil and Gas Reservoirs in the Hari Sag,Yingen-Ejinaqi Basin[J].Acta Sedimentologica Sinica,2022,40(2):557-572. |
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| Authors: | CHEN ZhiJun WANG WenHui LIU JinFeng BAI XiaoYin WANG XiaoDuo LI KeShe LI ZiLiang |
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| Institution: | 1.Research Institute of Yanchang Petroleum (Group) Co. Ltd. , Xi’an 710075, China2.College of Resources and Environment, Yangtze University, Wuhan 430100, China3.No. 2 Logging Company of CNPC Bohai Drilling Engineering Company Limited, Renqiu Hebei 062550, China |
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| Abstract: | In recent years， a significant amount of oil and gas reservoirs have been discovered in the Hari sag of the Yingen-Ejinaqi Basin， which proves that the area is a good prospect for oil and gas exploration. However， due to the complex geological conditions， in particular， the lack of understanding of the symbiotic characteristics and hydrocarbon accumulation mechanism of multi-type reservoirs， the scientific prediction of oil and gas distribution is severely limited， which restricts the process of oil and gas exploration in this area. Based on the analysis of various types of oil and gas reservoirs， this paper discusses the symbiotic characteristics and accumulation mechanism of multi-type oil and gas reservoirs， predicts the distribution of oil and gas， and analyzes the exploration direction， providing the basis for exploration decision-making and deployment in the study area. The study shows that there are many types of oil and gas reservoirs， such as dolomitic mudstone biogas reservoir， limestone mudstone gas reservoir， limestone mudstone oil reservoir， sandstone oil reservoir， and volcanic rock gas reservoir， for which the K1y， K1b2， and K1b1 source rocks are the main source rocks， and their oil and gas accumulation has “near source and within source” characteristics. The reservoirs are characterized by the coexistence of oil and gas reservoirs， conventional and unconventional reservoirs， and structural and lithologic reservoirs. The study of the oil and gas accumulation mechanism shows that the lack of an effective migration pathway is the main reason for “near source accumulation and in source accumulation”， the difference of thermal evolution degree of the main source rocks in different structural positions makes the oil and gas exhibit the distribution characteristic of “up oil and down gas”， and the development of a multi-type effective reservoir leads to the situation of “multi-type oil and gas reservoir symbiosis”. We predict that the cumulative oil and gas bearing area of various reservoirs in the study area is 381 km2. The calcareous mudstone gas reservoir， as the actual field of discovered reserves， is the main direction for future exploration， the sandstone reservoir is a potential field of expanding exploration results， making it the secondary direction， and the volcanic gas and calcareous mudstone oil reservoirs， as a beneficial supplement to the joint exploration of multiple types of oil and gas reservoirs， are the third potential direction. |
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