冷湖地区古近系储层成岩作用特征及其对孔隙演化的影响

Abstract

Abstract:

By using the drilling coring data, rock thin section, cast thin section, scanning electron microscope and logging data, and combined with the analysis of the test data, the diagenesis characteristics and its impact on reservoir porosity of Lenghu region of Paleogene has been carried on by the detailed study. The results showed that the maturity of the Lenghu region is low, the primary pore, secondary pore and micro cracks are both developed in the reservoir. The diagenesis types are complex, including compaction, cementation and dissolution. The compaction is the most fundamental reason for failure of reservoir. The porosity loss of the reservoirs in the study area caused of the compaction is 21.65 % in average. The cementation is an important factor for further reducing the reservoir pore loss, causing an average of 3.34 %. The dissolution of the reservoir is an important way to increase the hole, but due to the lack of dissolution fluid, its contribution is limited, increasing pores about 2.26 %. There is a positive correlation between the reservoir properties and maturity, and a negative correlation between the properties and depth, which show that the low maturity and deep buried Lulehe formation (E₁₊₂) has the strongest compaction and cementation, and the worst reservoir property. The property of lower Ganchaigou formation (E₃ ¹) was medium, and the upper of lower Ganchaigou formation(E₃ ²), which has the highest maturity and is the most shallow buried has the optimal reservoir property.

Key words: Qaidam basin, Lenghu region, Paleogene, diagenesis, pore evolution

CLC Number:

TE122

Bo Chen,Guoqiang Sun,Ji'an Shi, et al. Diagenesis of Paleogene formation in Lenghu region and its impact on porosity evolution[J]. Reservoir Evaluation and Development, 2018, 8(2): 7-13.

Figures/Tables 7

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Table 1

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References 20

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层位	石英,%	长石,%	岩屑,%	Q/(F+R)
上干柴沟组上段E₃²	29.31~56.82 39.89	25.80~49.46 35.81	3.81~36.43 24.30	0.41~4.45 1.58
下干柴沟组下段E₃¹	17.0~50.21 35.48	14.13~45.86 34.21	11.22~66.43 30.31	0.20-4.01 1.38
路乐河组 E₁₊₂	13.20~49.36 27.91	12.10~54.16 28.39	3.55~6.63 43.70	0.15~2.76 0.89

Diagenesis of Paleogene formation in Lenghu region and its impact on porosity evolution

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