| 珠江口盆地白云凹陷地温场特征及烃源岩热演化 |
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| 引用本文： | 黄玉平,龙祖烈,朱俊章,石创,张博,张小龙,陈聪.珠江口盆地白云凹陷地温场特征及烃源岩热演化[J].现代地质,2022,36(1):130-139. |
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| 作者姓名： | 黄玉平 龙祖烈 朱俊章 石创 张博 张小龙 陈聪 |
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| 作者单位： | 1. 中海石油深海开发有限公司,广东 深圳 5180542. 中海石油(中国) 有限公司深圳分公司,广东 深圳 518054 |
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| 基金项目： | 中海石油深海开发有限公司“万亿大气区”项目(KJZH-2021-0003-00)子课题“南海东部大中型天然气田勘探潜力与突破方向” |
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| 摘 要： | 通过对珠江口盆地白云凹陷108口钻井的地温数据(BHT、MDT、DST)进行校正、分析,以点到面重构白云凹陷的现今地温场,再结合地质与地球化学资料,正演恢复白云凹陷烃源岩的热演化史及生烃史.研究结果显示:(1)白云凹陷具有变地温场,地温梯度分布在35～60℃/km之间,呈现出南高北低的分布特征.(2)受控于白云凹陷变地...
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| 关 键 词： | 白云凹陷 温度校正 地温梯度 大地热流 热演化史 |
| 收稿时间： | 2021-06-10 |
| 修稿时间： | 2021-12-18 |
Geothermal Field Characteristics and Maturity History of Source Rocks in Baiyun Sag,Pearl River Estuary Basin |
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| HUANG Yuping,LONG Zulie,ZHU Junzhang,SHI Chuang,ZHANG Bo,ZHANG Xiaolong,CHEN Cong.Geothermal Field Characteristics and Maturity History of Source Rocks in Baiyun Sag,Pearl River Estuary Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(1):130-139. |
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| Authors: | HUANG Yuping LONG Zulie ZHU Junzhang SHI Chuang ZHANG Bo ZHANG Xiaolong CHEN Cong |
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| Institution: | 1. CNOOC Deepwater Development Limited,Shenzhen,Guangdong 518054,China2. Shenzhen Branch of CNOOC Ltd.,Shenzhen,Guangdong 518054,China |
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| Abstract: | By correcting and analyzing the geothermal data (BHT, MDT and DST) from 108 wells in the Baiyun Sag, Pearl River Estuary Basing we reconstructed the current geothermal field of the sag from spots to planes. Combined with geological and geochemical data, we forward simulated and restored the thermal evolution and hydrocarbon generation history of source rocks in the sag. The results show that: (1)the Baiyun Sag shows characteristics of varying geothermal field, and the geothermal gradient is distributed in 35-60 ℃/km, decreasing from south to north; (2)Controlled by the varying geothermal fields in the Baiyun Sag, the source rock thermal history of different depressions in the sag is different. The Wenchang Formation source rocks in the main depression are highly mature to over mature, and those in the east, west and south depressions are mature to highly mature; (3)The high varying geothermal field in the Baiyun Sag likely leads to the evolution characteristics of high heat and rapid maturity of source rocks. With increasing geothermal gradient, the maturity threshold of source rocks quickly becomes shallow, and the hydrocarbon generation window becomes narrow; (4)Different depressions in the Baiyun Sag have different hydrocarbon generation characteristics: Kerogen oil and gas generation in the Wenchang Formation source rocks in the main depression was early. The oil generation occurred mainly before 23.03 Ma, and the gas generation occurred in 33.9-10.0 Ma; Source rocks in the east, west and south depressions are buried shallow, and the hydrocarbon generation there was relatively late (since 23.03 Ma). The oil and gas are cogenetic. |
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| Keywords: | Baiyun sag temperature correction geothermal gradient heat flow thermal evolution history |
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