向后筛选策略在鄂尔多斯盆地三叠系延长组储层微观非均质性评价中的应用

doi:10.11743/ogg20220512

Abstract

Abstract:

The sixth and eighth members of Yanchang Formation （Chang 6 Member in Huaqing area and Chang 8 Member in Heshui area）， Ordos Basin， feature complex pore-throat structure and strong micro-heterogeneity under strong diagenetic transformation. The study re-defines evaluation parameters of the microscopic reservoir heterogeneity proposed by predecessors to better quantitatively characterize the microscopic heterogeneity of the reservoir. The backward elimination procedure is adopted to establish a regression equation for the Chang 6 reservoir in Huaqing area using relevant parameters proposed by the predecessors， with N， a parameter for comprehensive evaluation， proposed. Meanwhile， another regression equation is set for the Chang 8 reservoir in Heshui area using the parameters related to high-pressure mercury intrusion， with parameters G_k and G_s proposed， to make quantitative and comprehensive evaluation of the microscopic reservoir heterogeneity while verifying the feasibility of backward elimination in solving geological problems. The results show that parameter N is in good correlation with permeability， and the reservoir can be divided into three sections according to microscopic heterogeneity： strong， medium and weak sections， with correlation coefficients of 0.9812， 0.9496 and 0.7724， respectively. Besides， parameter G_k and porosity， as well as parameter G_s and permeability are also in good correlation. The correlation of the three comprehensive evaluation parameters is significantly higher than that of a single evaluation factor， indicating that backward elimination has achieved relatively ideal results in the quantitative evaluation of microscopic reservoir heterogeneity， and the mathematical method can provide new ideas for solving geological problems related.

Key words: quantitative characterization, microscopic heterogeneity, backward elimination, reservoir quantitative evaluation, Yanchang Formation, Heshui area, Huaqing area, Ordos Basin

CLC Number:

TE122.2

Fanchi Nan, Liangbiao Lin, Yu Yu, Zhaobing Chen, Shangchao Mu, Hongbo Wang, Guanhua Ji, Junmin Ma. Application of backward elimination procedure in evaluation of microscopic reservoir heterogeneity in Chang 6 Member， Ordos Basin[J]. Oil & Gas Geology, 2022, 43(5): 1155-1166.

Figures/Tables 10

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Statistics of parameters for microscopic reservoir heterogeneity evaluation"

表征参数	获取途径/计算公式	参考文献
排驱压力	高压压汞实验	吴小斌^［26］
中值压力	高压压汞实验	吴小斌^［26］
分选系数	高压压汞实验	林伶^［14］
颗粒非均质性	$β = D m a x - D m i n D m a x$	董利飞^［9］
胶结溶蚀指数	胶结溶蚀指数=胶结指数×溶蚀指数	曹江骏^［10］
	胶结指数=胶结物体积分数/（胶结物体积分数+粒间孔体积分数）
	溶蚀指数=易溶矿物体积分数/（易溶矿物体积分数+溶蚀孔体积分数）
成岩综合指数	成岩综合指数=（总面孔率×100 %）/（压实率+胶结率+微孔率+反溶蚀率）	曹江骏^［11］
	$压实率 = (Φ 1 - Φ 2) / Φ 1 × 100$ %
	$胶结率 = W / (W + P 1) × 100$ %
	$微孔率 = P 2 / P M × 100$ %
	$反溶蚀率 = 1 - P 3 / P T × 100$ %
充填指数	填隙物充填指数=填隙物含量/（填隙物含量+剩余粒间孔含量）	陈朝兵^［12］
抗溶蚀指数	抗溶蚀指数=易溶颗粒含量/（易溶颗粒含量+易溶颗粒溶孔含量）	陈朝兵^［12］
成岩综合指数	成岩综合指数=（面孔率×100 %）/（视压实率+视胶结率+视微孔率）	单祥^［3］

Table 1

Table 2

Fig.5

Table 3

Fig.6

Table 4

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参数	孔隙度		渗透率
参数	Pearson 相关性	显著性（双侧）	Pearson 相关性	显著性（双侧）
排驱压力	-0.690^**	0	-0.233	0.115
中值压力	-0.511^**	0.001	-0.537^**	0
分选系数	0.339^*	0.020	0.456^**	0.001
颗粒非均质性	-0.604^**	0	-0.604^**	0
胶结溶蚀指数	-0.600^**	0	-0.514^**	0
成岩综合指数（曹江骏）	0.755^**	0	0.709^**	0
充填指数	-0.712^**	0	-0.721^**	0
抗溶蚀指数	-0.711^**	0	-0.775^**	0
成岩综合指数（单祥）	-0.076	0.719	-0.006	0.979

参数	回归模型
参数	1	2	3	4	5	6
常量	0.866	0.877	1.135	1.119	1.149	1.328
中值压力	-0.002	-0.002	0	—	—	—
分选系数	-0.012	—	—	—	—	—
颗粒非均质性	0.317	0.283	—	—	—	—
胶结溶蚀指数	0.234	0.201	0.113	0.097	—	—
成岩综合指数	0.052	0.045	0.029	0.038	0.039	—
填隙物充填指数C	-0.303	-0.298	-0.312	-0.303	-0.287	-0.356
抗溶蚀指数K	-1.053	-1.021	-0.962	-0.957	-0.911	-0.994

储层	评价参数	公式	相关系数	样品个数
合水地区长8	G_k	y = 0.914 3x + 1.162 5	R2 = 0.567 0	579
合水地区长8	G_s	y = 0.204 8e^{0.446 7}^x	R2 = 0.718 7	478
华庆地区长6	G_k	y = 7.406 5lnx - 7.700 1	R2 = 0.892 5	167
华庆地区长6	G_s	y = 0.010 1x + 0.061 1	R2 = 0.938 8	212

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Application of backward elimination procedure in evaluation of microscopic reservoir heterogeneity in Chang 6 Member， Ordos Basin

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