富长石粗碎屑砂岩孔隙演化定量分析——以渤海湾盆地辽东凸起北段沙河街组二段为例

doi:10.11743/ogg20200419

Abstract

Abstract:

The coupling relationship between pore evolution and hydrocarbon charging plays an important role in hydro-carbon accumulation.However, an accurate quantitative analysis of the pore evolution is difficult.A porosity evolution model was therefore constructed with quantitative calculation parameters determined through analyses of microfabric, authigenic minerals, diagenetic sequences and thermal evolution of feldspar-rich coarse clastic sandstone reservoirs in the second member of the Shahejie Formation(Es²) in the north part of Liaodong uplift.The results show that the water-rock reaction of feldspar together with its products has a dominant effect on the reservoir porosity.While analyses of parameters including reservoir sorting coefficient, cement mass fraction, plane porosity of residual primary intergranular pores, total plane porosity, and plane porosity of dissolved pores, are important to the accuracy of quantitative calculation.The research indicates that compaction caused the strongest damage to the reservoirs from 38 to 23.3Ma, resulting in a porosity decrease of 15%.Cementation, which lasted almost the whole diagentic period, followed up to cut back the porosity by another 10.4% on average.However, erosion from 19 to 2 Ma served to increase the porosity by 9.8%.The physical properties of the reservoirs were gradually improving with hydrocarbon-charging and deteriorating as hydrocarbon charging ended.

Key words: low permeability, diagenesis, pore evolution, reservoir, Shahejie Formation, Bohai Bay Basin

CLC Number:

TE122.2

Longlong Guo, Hongde Cheng, Xiaobo Huang, Jun Wang, Chong Feng. Quantitative analysis on pore evolution in feldspar-rich coarse clastic sandstone: A case study of Es² in the north part of Liaodong uplift[J]. Oil & Gas Geology, 2020, 41(4): 874-883.

Figures/Tables 11

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Fig.2

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Fig.6

Fig.7

Table 1

Table 2

Table 3

Fig.8

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序号	计算公式	选取参数
公式1	${\Phi _1} = 20.91 + 22.90/{S_{\rm{o}}}$	Φ₁未固结储层孔隙度, %; Φ₂:压实后孔隙度, %; w:胶结物的质量分数; P₁:残余原生粒间孔面孔率, %; P_M:实测平均孔隙率, %; P_T:总面孔率, %; P₂:溶蚀孔面孔率, %; Φ₃:胶结后的孔隙度, %; Φ₄:溶解增加孔隙度, %; Φ₅:计算的现今孔隙度, %
公式2	${\Phi _2} = w + {P_1}{P_{\rm{M}}}/{P_{\rm{T}}}$
公式3	${\Phi _3} = {P_1}{P_{\rm{M}}}/{P_{\rm{T}}}$
公式4	${\Phi _4} = {P_2}{P_{\rm{M}}}/{P_{\rm{T}}}$
公式5	${\Phi _5} = {\Phi _3} + {\Phi _4}$

深度/m	早期方解石/%	硅质胶结/%	原生粒间孔/%	溶蚀面孔率/%	P₁/%	P₂/%	P_M/P_T	w
3 677	6	3	3	5	3	4.9	1.4	9.3
3 702	7	3	1	2	1	1.8	4.8	10.3
3 715	6	4	3	9	3	8.5	1.3	9.9
3 720	3	6	2	4	2	4.4	2.5	8.7
3 723	7	5	1	3	1	2.9	4.1	11.6
3 726	8	5	2	3	2	3.0	3	13.0

深度/m	未固结储层孔隙度/%	压实后孔隙度/%	压实减小的孔隙度/%	胶结后孔隙度/%	胶结减小的孔隙度/%	溶蚀增加的孔隙度/%	计算现今孔隙度/%	实测现今孔隙度/%
3 677	29.7	13.5	16.2	4.2	9.3	6.9	11.1	10.8
3 702	30.5	15.1	15.4	4.8	10.3	8.7	13.5	13.1
3 715	29.9	13.8	16.1	3.9	9.9	11.1	15.0	14.2
3 720	30.7	13.7	17.0	5.0	8.7	10.9	15.9	16.6
3 723	31.2	15.7	15.5	4.1	11.6	11.9	16.0	15.3
3 726	30.9	17.9	13.0	5.3	12.6	9.0	15.9	13.7
平均值	30.5	15.0	15.5	4.6	10.4	9.8	14.6	14.0

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Quantitative analysis on pore evolution in feldspar-rich coarse clastic sandstone: A case study of Es² in the north part of Liaodong uplift

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Quantitative analysis on pore evolution in feldspar-rich coarse clastic sandstone: A case study of Es² in the north part of Liaodong uplift