基于常规测井资料综合评价延川南致密砂岩气层

Abstract

Abstract:

In this paper, we proposed the interpretation thought and method for the tight sandstone gas reservoirs. Firstly, we took the comprehensive evaluation method, combining the traditional quantitative interpretation with the special evaluation and the analysis of geological background to establish the parameters of rock electricity evaluation by dividing structure and deposition. Then, we used the variation of porosity to establish the variation of rock electrical parameters. Based on the analysis of reservoir lithology, physical property background and sensitive curve characteristics, we used the gas bearing attributes of three kinds of porosity curves to identify the gas reservoir attributes. By comparing with the test data and a large number of test results, the accuracy of gas reservoir identification was improved obviously.

Key words: tight gas reservoir, log interpretation, variation of rock electrical parameters, indication method of gas bearing

CLC Number:

P631.84

Wang Anlong. Comprehensive evaluation of dense sandstone gas layer in southern Yanchuan area based on conventional logging data[J].Reservoir Evaluation and Development, 2019, 9(2): 75-79.

Figures/Tables 10

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Table 2

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Table 3

Table 4

Comparison between logging interpretation results and testing results"

井名	层号	深度段/ m	厚度/m	GR/ API	DEN/ （g·cm^-3）	CNL, %	AC/ （μs·m^-1）	LLD/ Ω	POR, %	PERM/ 10^-3μm²	Sg, %	SH, %	解释结论	测试结论	产量/ （m³·d^-1）
X1	16	639.5~651.0	11.5	36.80	2.46	14.40	273.10	138.94	16.00	3.24	66.00	7.00	气层	气层	4 155
X2	29	1 135.3~1 142.5	7.2	46.5	2.41	6.8	222.2	297.8	9	0.5265	63	8.8	气层	气层	6 158
X3	23	1 244.8~1 253.5	8.7	49.07	2.55	11.29	233.91	83.27	10.5	0.5265	50	18.49	气层	气层	1 862
X4	27	1 229.7~1 236.7	7	44			223.8	281.86	8.5	0.25	62	9.6	气层	气层	1 547
X5	23	1 191.6~1 194.0	2.4	67.20			233.70	121.86	10.00	0.34	60.00	15.70	气层	气层	4 051
X5	25	1 201.2~1 209.1	7.9	65.60			218.60	184.93	9.00	0.28	58.00	14.70	气层	气层	4 051
X6	11	983.4~987.4	4	28.2	2.42	14.3	256.5	110	14.3	2.484	63	10	气层	气层	6 756
X7	14	1 163.6~1 166.6	3	44.30			253.30	616.13	13.50	1.66	81.00	13.30	气层	气层	8 343
	18	1 217.0~1 218.7	1.7	49.60			242.50	236.05	12.80	1.00	70.00	11.40	气层	气层	8 343
	20	1 219.7~1 221.8	2.1	49.80			247.70	191.42	13.00	1.38	70.00	11.90	气层	气层	8 343
	22	1 225.7~1 229.6	3.9	56.40			236.70	348.83	10.00	0.46	68.00	16.40	气层	气层	8 343
X8	22	1 158.7~1 165.0	6.2	41.5			273.5	175.47	17	6.345	78	11.1	气层	气层	10 000
X8	25	1 195.3~1 197.9	2.6	46.5			245.6	447.67	12.5	0.972	80	14.1	气层	气层	10 000
X9	9	724.3~725.4	1.1	37.8			231.4	109.36	5.3	0.13	20.5	17.7	干层	干层	无产
X9	18	1 121.7~1 127.9	6.2	76.22	2.66	8.91	202.45	113.04	1.24	0.027	0.7	27.49	干层	干层	无产
X10	20	1 135.0~1 141.4	6.3	68.38	2.64	8.24	205.7	120.73	2.46	0.040 5	2.44	22.68	干层	干层	无产
X11	29	1 329.7~1 331.6	1.9	40.35	2.41	3.09	224.13	91.79	8.3	0.283 5	49	6.98	差气层	差气层	829
X11	15	812.9~814.0	1.1	50.33	2.47	12.20	244.16	157.62	7.88	0.36	49.45	20.44	差气层	干层	无产
X12	27	1 320.0~1 322.4	2.4	49.6	2.48	4.64	235.71	69.85	12	0.675	55	10.72	差气层	差气层	829
X13	17	1 127.3~1 129.3	2	64.85	2.21	26.86	254.92	104.95	7.6	0.310 5	43	24.36	差气层	差气层	320
X14	22	1 210.4~1 219.0	8.6	81.96	2.47	9.19	230.85	69.92	10.5	0.594	52	19.12	差气层	干层	无产
X15	19	1 127.9~1 135.0	7.2	55.57	2.57	7.24	223.52	69.47	9.3	0.378	33	12.78	气水同层	干层	无产

Table 4

References 10

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构造带	层位	Pickett图法
构造带	层位	a	b	m	n	R_wa/（Ω·m）
A构造带	石盒子组	1	1	1.73	2	0.37
A构造带	山西组	1	1	1.73	2	0.3
B构造带	石盒子组	1	1	1.73	2	0.47
B构造带	山西组	1	1	1.73	2	0.37

孔隙度,%	a	b	m	n
1.3	1	1.027 7	1.398	4.9
3.9	1	1.047 3	1.745	3.3
4.6	1	1.054 8	1.746	2.9
6.7	1	0.899 6	1.778	3.5
7.8	1	1.169 7	1.684	3.1
9.6	1	1.017 7	1.978	2.5
9.9	1	0.997 3	1.973	2.4
12.1	1	1.035 0	1.778	1.8

测井解释	原始编号	井深/ m	层位	孔隙度, %	可动流体, %	束缚流体, %	测井孔隙度平均值, %	分析孔隙度平均值, %	测井饱和度平均值, %	分析饱和度平均值, %
1号层（气层）	Y6-4	1 233.45~1 233.50	P₁s²	9.87	57.24	42.76	10.1	9.6	61.2	59.5
	Y6-5	1 234.10~1 234.15	P₁s²	10.48	67.11	32.89
	Y6-6	1 234.15~1 234.23	P₁s²	9.25	60.94	39.06
	Y6-7	1 234.80~1 234.85	P₁s²	8.99	52.71	47.29
3号层（差气层）	Y6-12	1 245.10~1 245.15	P₁s²	9.23	47.29	52.71	7.8	7.0	40.2	39.8
	Y6-13	1 245.75~1 245.80	P₁s²	5.58	33.46	66.54
	Y6-14	1 246.50~1 246.55	P₁s²	8.01	43.10	56.90
	Y6-15	1 247.15~1 247.20	P₁s²	4.05	31.42	68.58
	Y6-16	1 248.05~1 248.10	P₁s²	8.11	43.65	56.35

Comprehensive evaluation of dense sandstone gas layer in southern Yanchuan area based on conventional logging data

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