鄂尔多斯盆地奥陶系海相页岩气地质特征及勘探前景

doi:10.3969/j.issn.1672-7703.2021.02.004

摘要/Abstract

摘要： 鄂尔多斯盆地奥陶系海相页岩气具有独特的地质特征，客观评价泥页岩生烃能力及储集性能，预测甜点分布，可为盆地海相页岩气勘探提供指导。基于沉积古底形、构造—沉积演化的研究，提出了盆地西部奥陶系乌拉力克组为“坡上有洼、西深东浅”的沉积格局，发育深水斜坡相—广海陆棚相—盆地相沉积体系，明确了乌拉力克组页岩气整体具有“低丰度、低含气量、低孔隙度、低压”“高成熟度、高脆性、高渗透率”“埋深大”的特征，虽然烃源岩有机碳含量较低，但可有效生烃，并在局部形成富集，有别于四川盆地高丰度页岩气。通过开展测井—地质一体化研究，形成了盆地西部海相页岩气特有的中子—电阻率综合指数甜点预测技术，指出纵向甜点发育在乌拉力克组底部 20～30m 范围内，厚度为3～5m。明确了盆地西部中北段为勘探重点区，并落实4 个甜点区。在压裂工艺方面开展气体增能压裂试验，有效提升了地层压力，结合地质甜点优选，解决了“低压、低丰度”的缺陷，实现了海相页岩气领域的勘探突破，对鄂尔多斯盆地天然气勘探领域接替具有重要意义。

关键词: 鄂尔多斯盆地, 乌拉力克组, 海相, 页岩气, 勘探前景

Abstract: Ordovician marine shale gas in the Ordos Basin has its unique geological characteristics. Proper evaluation of hydrocarbon
generation and storage capacities of shale, and accurate prediction of sweet spot distribution will provide guidance for marine
shale gas exploration in the Ordos Basin. Study of sedimentary paleo-bottom shape and tectonic-sedimentary evolution has
been carried out, which indicates that the sedimentary framework of Wulalike Formation in the western Ordos Basin is characterized by “local low-lying areas on the slope, deep water environment in the west and shallow in the east” with a sedimentary system of deep-water slope—open marine shelf—basin. A set of thick and widely distributed source rocks is developed in Wulalike Formation with the characteristics of “low TOC, low gas content, low porosity, low pressure, high maturity, high brittleness, high permeability and great burial depth”. Although the organic carbon content is low, it can effectively generate hydrocarbons and enrich locally, which is different from the high-abundance shale gas in the Sichuan Basin. Integrated logging and geological research have developed a technology of neutron-resistivity composite index for sweet spot prediction specially for marine shale gas in the western Ordos Basin. The sweet spot interval is at the bottom of Wulalike Formation with a thickness of 3-5 m and four sweet spot areas have been identified in the central-north section of western Ordos Basin. At the same time, gas enhanced energy fracturing test has been conducted to increase formation pressure and solve the problem of “low pressure and low abundance”,achieving breakthrough in marine shale gas exploration, which has great significance for the replacement of natural gas exploration in the Ordos Basin.

中图分类号:

TE122.11

付锁堂, 付金华, 席胜利, 黄正良. 鄂尔多斯盆地奥陶系海相页岩气地质特征及勘探前景[J]. 中国石油勘探, 2021, 26(2): 33-44.

Fu Suotang, Fu Jinhua, Xi Shengli, Huang Zhengliang. Geological characteristics of Ordovician marine shale gas in the Ordos Basin and its prospects#br#[J]. China Petroleum Exploration, 2021, 26(2): 33-44.

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