| 海相低勘探程度地区油气资源评价:以柴达木盆地德令哈坳陷石炭系为例 |
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| 引用本文： | 刘成林,张禹,杨晟颢,李宗星,田继先,彭博,马寅生,杨元元,孔骅.海相低勘探程度地区油气资源评价:以柴达木盆地德令哈坳陷石炭系为例[J].地学前缘,2021,28(1):295-307. |
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| 作者姓名： | 刘成林 张禹 杨晟颢 李宗星 田继先 彭博 马寅生 杨元元 孔骅 |
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| 作者单位： | 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;中国石油大学(北京)地球科学学院,北京102249;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;中国石油大学(北京)地球科学学院,北京102249;中国石油长庆油田采油三厂,宁夏银川750000;中国地质科学院地质力学研究所,北京100081;中国石油勘探开发研究院,北京100083 |
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| 基金项目： | 国家自然科学基金项目(41572099);国家自然科学基金项目(41872127);中国地质调查局地质调查项目(1212011120964) |
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| 摘 要： | 海相低勘探程度地区油气资源评价的难点是资料少、地质认识程度低、主要参数获取难度大,影响评价结果可信性。以柴达木盆地德令哈坳陷石炭系为例,系统评价德令哈坳陷石炭系生储盖条件,油气资源评价选用盆地模拟法与类比法相结合方法,关键参数的确定采用了地球物理、地球化学与石油地质学等多种方法,利用油气运移聚集模拟和不同运聚单元资源量计算结果划分有利勘探区带,充分发挥不同方法的特点。评价结果表明:柴达木盆地德令哈坳陷上石炭统发育有泥岩、碳质泥岩、煤和泥灰岩等4类烃源岩,下石炭统发育泥岩和泥灰岩等2类烃源岩;上石炭统烃源岩有机质丰度较高,克鲁克组多数泥岩、碳质泥岩、煤和泥灰岩TOC含量分别为大于1.0%、6.0%~10.0%、大于60%、大于0.3%,有机质类型主要为Ⅱ和Ⅲ型,少量的Ⅰ型,成熟度均已达到成熟,具有较好的生烃潜力;石炭系发育碎屑岩储层和碳酸盐岩储层,并发育有多套盖层,生储盖组合类型有自生自储自盖式、下生上储上盖式和上生下储上盖式,石油地质条件总体较好;石炭系主要生烃时期为石炭纪晚期—三叠纪中期,生烃高峰时期为二叠纪中期—三叠纪中期;德令哈坳陷石炭系的油气资源量达到3.83×108 t(油当量),石油资源量为1.63×108 t,天然气资源量为2 760.21×108 m3,油气主要分布于欧南凹陷和欧龙布鲁克凸起两个构造单元。
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| 关 键 词： | 德令哈坳陷 石炭系 烃源岩 盆地模拟 资源评价 |
| 收稿时间： | 2019-12-05 |
Marine frontier basin petroleum resources assessment:A case study of the Carboniferous of the Delingha Depression,Qaidam Basin |
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| LIU Chenglin,ZHANG Yu,YANG Shenghao,LI Zongxing,TIAN Jixian,PENG Bo,MA Yinsheng,YANG Yuanyuan,KONG Hua.Marine frontier basin petroleum resources assessment:A case study of the Carboniferous of the Delingha Depression,Qaidam Basin[J].Earth Science Frontiers,2021,28(1):295-307. |
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| Authors: | LIU Chenglin ZHANG Yu YANG Shenghao LI Zongxing TIAN Jixian PENG Bo MA Yinsheng YANG Yuanyuan KONG Hua |
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| Institution: | 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China3. No.3 Oil Production Plant, Changqing Oilfield of PetroChina, Yinchuan 750000, China4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China5. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China |
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| Abstract: | Petroleum resources assessment for the marine frontier areas must face the challenges of few geologic data, low level of knowledge, and difficult parameter acquisition, which affect the credibility of petroleum resource assessment results. In this case study, we evaluated the Carboniferous of the Delingha Depression, Qaidam Basin using multiple methods, including resources assessment by basin modeling and analogous comparison and key parameter determination by geophysical, geochemical and petroleum geological analyses. Taking into account the source-reservoir-caprock association, we delineated the favorable exploration zones through simulation of hydrocarbon migration/accumulation and calculation of petroleum resources in different zones. There are four types of source rocks, mudstone, carbonaceous mudstone, coal and marl, in the upper Carboniferus, and two types of source rocks, mudstone and marl, in the Lower Carboniferous. In the Crook Formation, the upper Carboniferous source rocks have higher organic matter abundances, with the total organic (TOC) contents equaling >1.0%, 6.0%-10.0%, >60% and >0.3% in most mudstone, carbonaceous mudstone, coal and marl, respectively. The main types of organic matters are types II and III, with a small amount of type I. Most hydrocarbon rocks are mature and high mature. Clastic and carbonate reservoirs are developed in the Carboniferous strata into three sets of regional caprocks and five sets of local caprocks with varying forms of source-reservoir-caprock associations, including self source-self reservoir-self cap, lower source-upper reservoir and upper cap, and upper source-lower reservoir-upper cap. The hydrocarbon generation period of the Carboniferous was mainly from the Late Carboniferous to Middle Triassic, and the hydrocarbon generation peak moment was from the Middle Permian to Middle Triassic, when the basic geological conditions for petroleum formation were generally favorable. The Carboniferous of the eastern Qaidan Basin possesses 0.38 billion of petroleum, 0.16 billion tones of oil and 276 billion cubic meters of gas resources, with petroleum resources mainly distributing in the Ounan Sag and Oulongbuluke Uplift. |
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| Keywords: | Delingha Depression Carboniferous hydrocarbon source rock basin modeling resource assessment |
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