李伟(1984-),男,湖北孝感人,工程师,主要从事地震解释研究.E-mail: liwei_1041@163.com. |
收稿日期: 2022-12-19
修回日期: 2024-04-21
网络出版日期: 2024-11-08
Seismic characteristic of intrusive rock in the Upper Ordivican and its influence on the imaging of reservoir in the Shunbei area, Tarim Basin
Received date: 2022-12-19
Revised date: 2024-04-21
Online published: 2024-11-08
Supported by
The Project from Exploration and Development Research Institute of Northwest Oilfield Company, SINOPEC(34400008-21-ZC0607-0071)
近年来,塔里木盆地顺北东部地区奥陶系持续获得重大油气勘探突破,其得益于碳酸盐岩断控缝洞型优质储集体的有效地震识别与分布预测。随着勘探工作向顺北西部地区推进,上奥陶统发育多套复杂侵入岩,导致地震成像效果差,断裂和储层识别难度大,严重制约了西部地区的勘探进程。基于实钻、3D地震资料和区域地质资料,在对顺北地区上奥陶统内发育的侵入岩特征进行详细研究的基础上,开展中下奥陶统储层地震反射正演模拟,建立了多种复杂侵入岩与缝洞型储层的地质模型。正演模拟表明:侵入岩边界部位会造成地震剖面上的相位错断,甚至影响上奥陶统底面形成假象断层;近水平厚层状、多层叠合发育的侵入岩还会造成中下奥陶统的储层段内形成不易识别的多次波,对断控储集体形成的串珠状反射起到能量补充作用,导致串珠状反射能量增强,被误识别为有利储层反射特征。通过正演模拟与地震属性的有效结合,明确了研究区内假断层的识别方法,量化了侵入岩厚度与下伏串珠状反射能量强度的关系,以及侵入岩对储层成像的影响程度,有效提高了断裂识别的可靠性和储层描述的精度,为研究区及周边地区下一步勘探部署提供了重要的地球物理依据。
李伟 , 韩龙 , 刘军 , 刘海军 , 龚伟 , 谢雄举 , 张荣 , 侯佳凯 . 塔里木盆地顺北地区奥陶系侵入岩发育特征及对储层成像的影响[J]. 天然气地球科学, 2025 , 36(1) : 155 -165 . DOI: 10.11764/j.issn.1672-1926.2024.04.020
Significant breakthrough in petroleum exploration has been obtained recently in the Ordovician strata in the eastern Shunbei area, Tarim Basin, which is benefit from the identification of fault-controlled carbonated fracture-vuggy reservoir and prediction of its distribution. As the exploration moves into westward area, the development of multiple sets of complex intrusive rock in the Upper Ordovician has caused poor seismic imaging, which has great impact on the identification of fractures and reservoirs in the Middle and Lower Ordovician and restricts the exploration process in this area. Based on the drilling, 3D seismic data and regional geological background, this study established a variety of complex intrusions and fracture-vuggy reservoirs model and carried out seismic refection forward modelling of Middle and Lower Ordovician reservoirs on the basis of detailed study of the characteristics of intrusions developed in the Upper Ordovician in the Shunbei area. According to the study, the intrusive rock not only leads to the disjunction of phase at the edge of the intrusion in the seismic profile, but also forms pseudo-faults in the Upper Ordovician underside. In addition, the nearly horizontal thick-bedded, multi-layered intrusions can also cause the formation of multiple waves in the Middle and Lower Ordovician. Furthermore, the multiple waves can strength the amplitude of the beaded reflection caused by the fractures and cavities, which increase the difficulties in the re-cognization of the favorable reservoirs. By combining forward modeling and seismic attributes, the fault identification method is defined, both of the relationship between intrusive rock thickness and amplitude and the influence degree of intrusive rock on reservoir imaging are quantified, all of which can greatly improve the reliability of fault identification and the accuracy of reservoir description, thus provide a geophysical basis for the next exploration deployment.
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