Special Oil & Gas Reservoirs >

2021 , Vol. 28 >Issue 6: 27 - 35

DOI: https://doi.org/10.3969/j.issn.1006-6535.2021.06.004

Geologic Exploration

Reservoir Controlling Factors and Development Model of Middle Permian Lucaogou Formation in Chaiwopu Sag

  • Zhang Guanlong ,
  • Wang Yue ,
  • Zhang Kuihua ,
  • Yu Hongzhou ,
  • Xiao Xiongfei
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  • Sinopec Shengli Oilfield Company, Dongying, Shandong 257015, China

Received date: 2020-10-12

  Revised date: 2021-09-25

  Online published: 2022-02-16

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Abstract

In order to work out the distribution pattern of favorable reservoirs in Middle Permian Lucaogou Formation in Chaiwopu Sag, the reservoir characteristics and controlling factors of Lucaogou Formation were systematically analyzed and the reservoir development pattern was established according to the test data such as core, rock slice, X-ray diffraction and scanning electron microscope, in combination with the characteristics of tectonic evolution and sedimentary system distribution. The study results showed that the reservoir space of Lucaogou Formation was dominated by dissolved pores and micro-fractures, and was mainly composed of reservoirs with ultra-low porosity and ultra-low permeability. In the nearshore subaqueous fan adjacent to Yilinheibiergen Mountain, the primary porosity of glutenite at the fan center was low and the reservoir was denser due to vertical and lateral compaction in the early diagenetic stage. The glutenite at the margin of the nearshore subaqueous fan was mainly subjected to the effect of vertical compression while the effect of lateral compaction was weak in the early diagenetic stage. The strong dissolution effect of acidic fluids released from source rocks in the late diagenetic stage made more inter-granular and intra-granular dissolved pores, form the most favorable sedimentary facies belt for hydrocarbon accumulation. The sandbody of turbidite fan was sandwiched in the deeper or deep lacustrine thick source rocks, developed with dissolved pores, forming a "sweet spot" reservoir for oil and gas exploration. The study results provide an important geological basis for the deployment of prospecting wells in Chaiwopu Sag.

Key words： reservoir characteristics; reservoir controlling factors; reservoir evolution model; Lucaogou Formation; Chaiwopu Sag

Cite this article

Zhang Guanlong , Wang Yue , Zhang Kuihua , Yu Hongzhou , Xiao Xiongfei . Reservoir Controlling Factors and Development Model of Middle Permian Lucaogou Formation in Chaiwopu Sag[J]. Special Oil & Gas Reservoirs, 2021 , 28(6) : 27 -35 . DOI: 10.3969/j.issn.1006-6535.2021.06.004

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