廊固凹陷奥陶系潜山不整合输导特征与油气优势运聚方向
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本文为中国石油天然气股份有限公司重大科技专项“华北油田持续有效稳产勘探开发关键技术研究与应用”(编号2017E- 15)、华北油田公司校企合作课题(编号HBYT- YJY- 2018- JS- 177)联合资助的成果。


Unconformity characteristics and the dominant migration and accumulation direction of the Ordovician buried hill in the Langgu depression
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    摘要:

    不整合是廊固凹陷奥陶系潜山油气运移的重要输导通道和聚集部位,研究不整合分布及其输导特征对明确该区油气优势运移方向以及寻找有利勘探目标具有重要意义。以廊固凹陷奥陶系潜山顶面不整合的类型及分布规律、纵向结构特征为基础,对潜山顶面不整合的输导性和有效性进行了分析;利用钻井、测井、岩芯等资料对半风化岩石层进行了精细解剖,明确了主力输导通道分布和渗滤空间类型;在明确不同类型不整合展布规律后结合数值模拟确定了油气优势运移方向和潜在有利勘探区。研究结果表明,河西务潜山带奥陶系顶面不整合具有4种接触关系、2种运移通道,组合形成4种油气运聚类型,其中石炭系—二叠系覆盖的褶皱区最有利于油气聚集成藏。不整合半风化岩石层的渗滤通道类型南北具有差异性,南部岩溶发育,以溶蚀缝洞为主,北部以晚期构造缝为主。纵向上,垂直渗流带和水平潜流带是不整合岩溶带中的优势运移通道。平面上,不整合输导脊是油气的优势运移路径,位于其上的构造高点是油气聚集的有利区,杨税务南潜山和中岔口潜山是下一步油气勘探的潜在目标。

    Abstract:

    An unconformity is an important transporting pathway and accumulation site of oil and gas in the Ordovician buried hill in the Langgu depression. The study of unconformity distribution and its transport characteristics is of great significance for the determination of the dominant migration direction of oil and gas and the search for favorable exploration targets in this area. Based on the type, distribution and longitudinal structural characteristics of the unconformity on top of the Ordovician buried hill in the Langgu depression, the paper analyzes the conductivity and effectiveness of the unconformity on the top of the buried hill. By using the data from drilling, logging, and cores, the fine anatomy of the semi weathered rock layer is studied and the distribution of the main transport channel and the type of seepage spaces are confirmed. Based on the different types of unconformity distribution, the dominant migration direction and potential favorable exploration area are determined by numerical simulation. The results show that there are 4 contact relations and 2 migration channels in the top unconformity of Ordovician in the Hexiwu buried hill belt, and 4 types of oil and gas migration and accumulation are formed in combination, among which the fold area covered by C- P is the most favorable for oil and gas accumulation. The types of infiltration channels in north to south are different. The karst in the south is more developed, and the infiltration channel is mainly dissolution fracture and caves, while the north is mainly late structural fracture. Vertically, the vertical seepage zone and the horizontal undercurrent zone are the dominant migration channels in the unconformity karst zone. The structural highs on the path of oil- gas dominant migration and accumulation are favorable areas for oil- gas accumulation. South of the Yangshuiwu and the Zhongchakou buried hills are potential targets for future oil- gas exploration.

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杨德相,李振明,田建章,王元杰,李凯茜,张传宝,明锦,贾颖超,边滢滢.2021.廊固凹陷奥陶系潜山不整合输导特征与油气优势运聚方向[J].地质学报,95(8):2575-2589.
Yang Dexiang, Li Zhenming, Tian Jianzhang, Wang Yuanjie, Li Kaixi, Zhang Chuanbao, Ming Jin, Jia Yingchao, Bian Yingying.2021. Unconformity characteristics and the dominant migration and accumulation direction of the Ordovician buried hill in the Langgu depression[J]. Acta Geologica Sinica,95(8):2575-2589.

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  • 收稿日期:2020-04-30
  • 最后修改日期:2020-06-05
  • 录用日期:2020-06-12
  • 在线发布日期: 2021-03-29
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