鄂尔多斯盆地长8储层碳酸盐胶结物成分组成与碳氧同位素特征研究

Abstract

Abstract:

Based on the study of the carbon oxygen isotopic characteristics and the observation of thin slices, we systematically studied the carbonate cementation of Chang-8 reservoir in Ordos Basin. According to the observation of the minerals under the microscope, it can be concluded that the carbonate cements were composed of the calcite, dolomite, ferrodolomite, ferrocalcite and siderite. The mineral composition and distribution are strongly influenced by the heterogeneous chemical activity of fluids. The carbonate cementation often damages the porosity and permeability. Meanwhile, the C-O isotope value was determined by the phosphoric acid method. The experimental results show that the range of carbon isotope distribution is -14.8 ‰ to -1.5 ‰, and the distribution range of oxygen isotope is -25.7 ‰ to -9.9 ‰. The Z values of the samples are mostly less than 120, indicating that the carbonate cements in the sample formed in the freshwater-brackish water environment. The paleo temperature was measured from 68 ℃ to 128 ℃ by oxygen isotope value, which shows that the cementation occurred mainly in the early diagenetic stage B to the middle diagenetic stage A. The carbonate cement content in the upper part of Chang-8 is much lower than that in the lower part, indicating that cementation was derived from carbonate deposits which were related to decarboxylation of organic acids. According to the sedimentary subfacies, the study area is divided into three areas, and the oxygen-carbon isotope gradually decreases in accordance with the half deep lacustrine subfacies-gravity flow subfacies-delta subfacies. Finally, the reasons for the present situation of isotope distribution in the basin are concluded: the organic acid moves gradually from the high potential region to the low potential region under the compaction, and the organic carbon is captured by chemical cementation after a series of chemical changes.

Key words: Ordos Basin, carbonate cementation, carbon oxygen isotope, sedimentary environment, paleo temperature, provenance, solute transport model

CLC Number:

TE122.2

Zhao Wang,Junli Qiu. Study on composition, carbon and oxygen isotopic characteristics of carbonate cements in Chang-8 reservoir, Ordos Basin[J]. Reservoir Evaluation and Development, 2018, 8(2): 14-21.

Figures/Tables 8

Fig. 1

Table 1

Carbon and oxygen isotopic data of carbonate cements in Chang-8 reservoir of Yanchang formation, Ordos Basin"

序号	井名	深度/m	层位	岩石类型	沉积相	δ¹³C ‰	δ¹⁸O ‰	Z值	古温度/℃
1	Y1-1	2 129.87	长8₁	灰褐色含油细砂岩	浊流	-2.4	-19.8	112.52	120.26
2	Y1-2	2 162.84	长8₁	灰褐色含油细砂岩	三角洲平原	-8.5	-16.7	101.58	97.1
3	Y1-3	2 252.98	长8₁	灰褐色含油细砂岩	三角洲平原	-6.3	-14.2	107.33	79.83
4	Y1-4	1 920.10	长8₁	灰绿色细砂岩	砂质碎屑流	-5.8	-14.8	108.05	83.86
5	Y1-5	2 827.40	长8₁	灰褐色含油细砂岩	三角洲前缘	-9.8	-19.4	97.57	117.16
6	Y1-6	2 244.55	长8₁	灰褐色含油细砂岩	三角洲前缘	-6.4	-23.7	102.39	152.12
7	Y1-7	2 211.06	长8₁	灰褐色含油细砂岩	三角洲前缘	-5.5	-25.7	103.24	169.64
8	Y1-8	2 793.27	长8₁	灰褐色含油细砂岩	三角洲平原	-7.8	-19.8	101.47	120.26
9	Y1-9	2 330.08	长8₁	灰褐色含油细砂岩	三角洲平原	-7.9	-20.8	100.76	128.14
10	Y1-10	2 236.35	长8₁	灰褐色致密细砂岩	三角洲前缘	-9	-19.4	99.21	117.16
11	Y1-11	1 744.12	长8₁	灰褐色致密细砂岩	半深湖	-1.6	-15.5	116.3	88.66
12	Y1-12	2 597.52	长8₁	灰褐色含油细砂岩	三角洲平原	-8.8	-16.4	101.11	94.96
13	Y1-13	2 535.05	长8₁	灰褐色含油细砂岩	三角洲前缘	-8.6	-21	99.23	129.74
14	Y1-14	2 391.91	长8₁	灰褐色含油细砂岩	浊流	-5	-14.2	109.99	79.83
15	Y1-14	2 426.90	长8₁	灰褐色含油细砂岩	三角洲平原	-10.3	-15.2	98.64	86.59
16	Y1-15	1 809.77	长8₁	灰褐色含油细砂岩	浊流	-5.6	-15.5	108.11	88.66
17	Y1-16	2 538.42	长8₁	灰绿色细砂岩	三角洲前缘	-9.7	-17.7	98.62	104.36
18	Y1-17	1 397.73	长8₁	灰褐色含油细砂岩	砂质碎屑流	-5.7	-14.3	108.51	80.5
19	Y1-18	2 085.94	长8₁	灰褐色含油细砂岩	三角洲前缘	-7.8	-15.1	103.81	85.9
20	Y1-19	2 124.68	长8₁	灰褐色含油细砂岩	三角洲前缘	-7.1	-15.9	104.84	91.44
21	Y1-19	2 124.68	长8₁	灰褐色含油细砂岩	三角洲前缘	-6.7	-15.6	105.81	89.35
22	Y1-20	2 008.60	长8₁	灰褐色含油细砂岩	三角洲前缘	-8.1	-16.4	102.54	94.96
23	Y1-20	2 026.62	长8₁	灰褐色含油细砂岩	三角洲前缘	-6.7	-15.8	105.71	90.74
24	Y1-21	1 963.10	长8₁	灰褐色含油细砂岩	砂质碎屑流	-4.6	-14.8	110.51	83.86
25	Y1-22	2 617.34	长8₁	灰褐色含油细砂岩	三角洲前缘	-8	-16	102.95	92.14
26	Y1-23	2 562.44	长8₁	灰绿色细砂岩	三角洲前缘	-7.7	-23	100.08	146.18
27	Y1-24	2 477.37	长8₁	灰褐色含油细砂岩	三角洲前缘	-9.7	-20.4	97.28	124.96
28	Y1-25	2 727.00	长8₁	灰褐色含油细砂岩	三角洲平原	-12.8	-18.6	91.82	111.07
29	Y1-26	2 736.05	长8₁	灰褐色含油细砂岩	三角洲平原	-12.1	-17.8	93.65	105.1
30	Y1-27	2 728.56	长8₁	灰褐色含油细砂岩	三角洲平原	-12.2	-17	93.85	99.26
31	Y1-28	2 518.41	长8₁	灰绿色砂岩	三角洲平原	-9.2	-24.4	96.31	158.16
32	Y1-29	2 591.90	长8₁	灰褐色含油细砂岩	三角洲平原	-11.3	-16.1	96.14	92.84
33	Y1-30	2 288.88	长8₁	灰褐色含油细砂岩	三角洲前缘	-8.7	-22.3	98.38	140.34
34	Y1-31	2 238.45 2 238.50	长8₁	灰褐色含油细砂岩	砂质碎屑流	-3.5	-17	111.67	99.26
35	Y1-32	2 266.80	长8₁	灰褐色含油细砂岩	砂质碎屑流	-2.36	-17.6	113.7	103.63
36	Y1-32	2 272.40	长8₁	灰褐色含油细砂岩	三角洲前缘	-6.45	-18.2	105.03	108.07
37	Y1-32	2 274.00	长8₁	灰褐色含油细砂岩	三角洲前缘	-6.61	-17.6	105	103.63
38	Y1-32	2 275.00	长8₁	灰绿色砂岩(致密)	三角洲前缘	-7.02	-16.3	104.81	94.26
39	Y1-32	2 277.90	长8₁	灰黑色泥岩	浊流	-4.1	-14.3	111.78	80.5
40	Y1-33	2 209.20	长8₁	灰黑色泥岩	三角洲前缘	-7	-14.6	105.69	82.51
41	Y1-34	1 254.29	长8₁	灰黑色泥岩	三角洲前缘	-7.2	-13.6	105.78	75.87
42	Y1-35	1 319.38	长8₁	灰黑色泥岩	砂质碎屑流	-3.7	-10.5	114.49	56.56
43	Y1-36	1 284.58	长8₁	灰黑色泥岩	浊流	-4.5	-9.9	113.15	53.04
44	Y2-1	1 248.33	长8₂	灰黑色泥岩	浊流	-5	-13.2	110.49	73.27
45	Y2-2	2 583.48	长8₂	灰褐色含油细砂岩	三角洲平原	-9.5	-25.4	95.19	166.96
46	Y2-3	2 969.62	长8₂	灰褐色含油细砂岩	三角洲平原	-9.2	-17.8	99.59	105.1
47	Y2-4	1 899.05	长8₂	灰褐色含油细砂岩	浊流	-5.7	-16.3	107.51	94.26
48	Y2-5	2 596.45	长8₂	灰褐色含油细砂岩	三角洲平原	-11.7	-17.8	94.47	105.1
49	Y2-6	2 022.38	长8₂	灰褐色含油细砂岩	三角洲平原	-10	-15.1	99.3	85.9
50	Y2-7	2 621.00	长8₂	灰褐色含油细砂岩	三角洲平原	-9.5	-15.3	100.22	87.28
51	Y2-8	2 107.14	长8₂	灰褐色致密细砂岩	半深湖	-1.5	-15.7	116.41	90.04
52	Y2-9	2 231.8	长8₂	灰褐色含油细砂岩	三角洲前缘	-9	-20.4	98.71	124.96
53	Y2-10	2 510.13	长8₂	灰绿色细砂岩	三角洲前缘	-14.8	-18.9	87.58	113.34
54	Y2-11	2 133.42	长8₂	灰绿色细砂岩	三角洲前缘	-8.2	-15	103.04	85.22
55	Y2-12	2 241.72	长8₂	灰褐色含油细砂岩	三角洲平原	-9.5	-14	100.87	78.5
56	Y2-13	2 256.55	长8₂	灰褐色含油细砂岩	三角洲前缘	-11.1	-18.1	95.55	107.32
57	Y2-14	2 454.93	长8₂	灰褐色含油细砂岩	三角洲前缘	-12.1	-19.2	92.96	115.63

Table 1

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Study on composition, carbon and oxygen isotopic characteristics of carbonate cements in Chang-8 reservoir, Ordos Basin

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