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东濮凹陷前梨园地区新生代热史 ——基于磷灰石裂变径迹和镜质组反射率耦合反演
断块油气田
2019年 26卷 第06期
阅读：122
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Title
Cenozoic thermal history in Qianliyuan area of Dongpu Sag: using apatite fission track
and vitrinite reflectance coupling inversion
单位
中国石油大学（北京）地球科学学院，北京 102249
成都理工大学“油气藏地质与开发工程”国家重点实验室，四川 成都 610059
Organization
College of Geosciences, China University of Petroleum, Beijing 102249, China
State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
摘要
前梨园地区具备较好的烃源岩条件，是东濮凹陷油气勘探的重要地区，但作为油气资源评价的基础研究工作—热演化史研究较为薄弱。因此，文中利用前梨园地区160个镜质组反射率数据和2个磷灰石裂变径迹数据对新生代热史进行了恢复，以此为基础，利用BasinMod 1D盆地模拟软件恢复了该地区的烃源岩热演化史。结果显示，新生代热史呈现“马鞍型”特征，经历了2期地温梯度高峰期，分别是沙三段沉积时期和东营组沉积中期，地温梯度分别为46~48 ℃/km和40~45 ℃/km。2次地温梯度高峰期揭示了前梨园地区经历了2期强烈裂陷作用。此外，烃源岩成熟演化结果揭示了前梨园地区东营组沉积时期的古地温场控制着其烃源岩成熟度演化。研究成果可以为前梨园地区的油气资源评价提供科学依据。
Abstract
The Qianliyuan area, which has good source rock conditions, is the important area for oil and gas exploration in the Dongpu Sag. However, as the foundation task for evaluation of oil and gas resources, the study of the thermal evolution history is relatively weak. Therefore, in this paper, 160 vitrinite reflectance and two apatite fission track data from the Qianliyuan area were used to restore the Cenozoic burial history and thermal history, and based on these results, the maturity evolution history of source rocks was restored by BasinMod 1D. The results show that the Cenozoic thermal history exhibits a general trend of the "saddle type", which has reached twice high peaks of geothermal gradient during the Shahejie 3 Formation with the geothermal gradient of 46￣48 °C/km and during the middle deposition of the Dongying Formation with the geothermal gradient of 40￣45 °C/km. The twice high peaks of geothermal gradient show the Qianliyuan area had experienced two phases of strong rifting. Moreover, the results of the maturity evolution of the source rock revealed that the maturity evolution was controlled by the paleogeothermal fields of the Dongying Formation depositional period in the Qianliyuan area. The results of this paper provide scientific basis for oil and gas resources evaluation in the Qianliyuan area.
关键词：
裂变径迹;
镜质组反射率;
古地温梯度;
热史;
东濮凹陷
;
Keywords:
apatite fission track;
vitrinite reflectance;
Paleogeothermal gradient;
thermal history;
Dongpu Sag
;
DOI
10.6056/dkyqt201906003
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