Microfracture characteristics and its controlling factors in the tight oil sandstones in the southwest Ordos Basin: Case study of the eighth member of the Yanchang Formation in Honghe Oilfield

Wen-ya LÜ; Lian-bo ZENG; Si-bin ZHOU; Yuan-yuan JI; Feng LIANG; Chen HUI; Jia-sheng WEI

doi:10.11764/j.issn.1672-1926.2019.08.006

2020 , Vol. 31 >Issue 1: 37 - 46

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.08.006

Microfracture characteristics and its controlling factors in the tight oil sandstones in the southwest Ordos Basin: Case study of the eighth member of the Yanchang Formation in Honghe Oilfield

Wen-ya LÜ ^,¹^,² ,
Lian-bo ZENG ^,¹^,² ,
Si-bin ZHOU ³ ,
Yuan-yuan JI ⁴ ,
Feng LIANG ² ,
Chen HUI ² ,
Jia-sheng WEI ⁵

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^1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
^2. College of Geosciences, China University of Petroleum, Beijing 102249, China
^3. Exploration and Development Research Institute of North China Company, Sinopec, Zhengzhou 450006, China
^4. The First Oil Production Plant of North China Company, Sinopec, Qingyang 745000, China
^5. The Sixth Gas Production Plant of PetroChina Changqing Oilfield Company, Xi’an 710016, China

Received date: 2019-04-22

Revised date: 2019-08-18

Online published: 2020-01-09

Supported by

The National Science & Technology Major Projects of China(2017ZX05009001-002)

The Science Foundation of China University of Petroleum, Beijing(2462017YJRC057)

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Highlights

Based on the analysis of thin sections and scanning electron microscope, in combination with cores and well logs, microfracture characteristics and its controlling factors were systematicly analyzed in the tight sandstone reservoir of the eighth member of the Yanchang Formation in the Honghe Oilfield in the southwest Ordos Basin. Then, the distribution characteristics of microfractures in the typical Q1 well area were analyzed. The results show that from the perspective of geologic origins, microfractures can be divided into four types in the study area, i.e., tectonic origin, diagenetic origin, tectonic-diagenetic origin and overpressure origin. Among these microfractures, tectonic origin and tectonic-diagenetic origin microfractures are the most abundant. Most microfractures are effective, while some micorfractures are filled with calcite, quartz, mud and so on. Microfracture development degree is influenced by sedimentation, diagenesis, tectonism and overpressure. With the increase of matrix content and plastic element content such as mica debris, and the decrease of grain size, microfracture intensities decrease. The stronger the compaction is, the more abundant intragranular and grain edge fractures are developed, which are tectonic-diagenetic origins. Intragranular and grain-edge fracture intensities decrease as the cementing strength increases, thus being favorable for the development of tectonic origin microfractures. In the typical Q1 well area, microfractures are most developed in the fine sandstones with strong compaction and strong calcite cementation; next being fine sandstones with strong compaction and medium-fine sandstone with moderate calcite cementation. Microfractures are relatively weakly developed in fine sandstone with kaolinite compaction and fine sandstone with chlorite cementation and moderate dissolution. The development of microfractures is the weakest in mudstones.

Cite this article

Wen-ya LÜ , Lian-bo ZENG , Si-bin ZHOU , Yuan-yuan JI , Feng LIANG , Chen HUI , Jia-sheng WEI . Microfracture characteristics and its controlling factors in the tight oil sandstones in the southwest Ordos Basin: Case study of the eighth member of the Yanchang Formation in Honghe Oilfield[J]. Natural Gas Geoscience, 2020 , 31(1) : 37 -46 . DOI: 10.11764/j.issn.1672-1926.2019.08.006

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