苏北盆地溱潼凹陷阜三段浅水三角洲沉积古地貌、古环境恢复

doi:10.13809/j.cnki.cn32-1825/te.2023.03.012

Abstract

Abstract:

Palaeogeomorphology and palaeo-environment conditions are the main environmental factors affecting the sedimentation. Due to the frequent water change, complex terrain and high difficulty in seismic identification and tracking, the reconstruction research of palaeogeomorphology and palaeo-environment in the 3rd member of Funing Formation in Qintong Sag of Subei Basin is still insufficient, which affects the overall exploration evaluation of the study area. In order to clarify the palaeogeomorphology and palaeo-environmental conditions of the 3rd member of Funing Formation in Qintong Sag during the deposition period, the formation core, logging data and rock material data are comprehensively analyzed. The semi-quantitative reconstruction of the palaeogeomorphology of the 3rd member of Funing Formation is carried out by combining the palaeo-geologic map, impression method and residual thickness method, and the pyrolysis experiment data, TOC and trace element content data of 33 rock samples from two wells are selected to carry out the palaeo-environment reconstruction analysis. Accordingly, paleogeomorphology reconstruction in map form and the curves of palaeo-environment changes of the 3rd member of Funing Formation in Qintong Sag are drawn, which prove that the study area is a half-graben, lower in the South and higher in the North with the convergence across the east-west direction, the climate is warm and humid during the sedimentary period, the water body activity is frequent and recurrent, the water salinity is low, the multiple source is supplied intermittent, the material source input continues to increase, and the deposition rate is fast. Therefore, the corresponding relationship between stratigraphic physical parameters and paleogeomorphology, geochemical parameters and paleoenvironment in the study area are clarified, which provide reference for the further exploration and development.

Key words: palaeogeomorphology reconstruction, trace element analysis, palaeo-environment reconstructions, the 3rd member of Funing Formation, Qintong Sag

CLC Number:

TE111

Hao CHENG,Zhenkui JIN,Wenduan YU, et al. Sedimentary palaeogeomorphology and palaeo-environment reconstruction of shallow water delta in the 3rd member of Funing Formation in Qintong Sag, Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(3): 368-378.

Figures/Tables 11

Fig. 1

Fig. 2

Table 1

Fig. 3

Fig. 4

Table 2

Table 3

Table 4

Fig. 5

Table 5

Analysis and test data of formation samples of the 3rd member of Funing Formation in Qintong Sag, Subei Basin"

井名	序号	深度/ m	有机碳/%	岩石热解/10^-3		微量元素含量/10^-6
井名	序号	深度/ m	TOC	S1	S2	V	Ni	Ga	Cu	Sr	Ba	Th	U	La	Yb
南华 201 井	1	1 758.96	0.69	0.07	0.35	74.9	27.6	25.3	19.9	208	525	14.0	2.7	52.0	3.5
	2	1 759.27	1.01	0.05	0.42	81.0	40.6	28.3	27.3	221	493	15.8	2.4	55.7	4.0
	3	1 759.44	1.14	0.09	0.41	91.8	37.6	30.4	26.7	188	460	15.8	2.6	60.2	4.3
	4	1 759.61	0.83	0.17	0.38	57.2	34.8	25.1	20.4	195	540	14.1	2.6	56.1	3.6
	5	1 759.78	0.99	0.05	0.37	80.8	39.0	17.6	23.2	233	523	17.6	2.9	50.0	3.3
	6	1 759.95	1.25	0.06	0.51	53.9	31.6	19.1	21.7	191	472	13.8	2.3	53.6	3.4
	7	1 760.15	1.10	0.25	0.52	97.3	43.0	21.4	28.3	234	580	18.0	3.1	55.9	3.5
	8	1 760.36	1.02	0.49	0.62	85.5	45.5	19.3	27.8	215	523	17.3	3.0	51.6	3.2
	9	1 760.57	1.05	0.28	0.48	82.1	53.4	20.2	33.1	227	529	17.7	3.4	55.4	3.6
	10	1 761.01	0.96	0.07	0.36	84.1	37.1	17.4	24.1	190	478	15.6	2.4	53.7	3.1
	11	1 761.20	0.97	0.10	0.37	104.0	47.6	20.8	30.6	241	488	17.8	2.9	57.2	3.4
	12	1 761.37	1.07	0.07	0.49	86.6	50.5	24.6	32.1	223	526	19.1	3.1	54.7	3.8
	13	1 761.54	0.92	0.13	0.35	74.3	42.4	22.5	26.5	229	452	15.6	2.2	58.3	3.5
	14	1 761.71	1.00	0.03	0.36	66.1	34.5	23.7	23.6	183	432	16.2	2.4	57.6	3.5
	15	1 761.91	1.03	0.04	0.42	90.2	37.3	19.2	25.7	218	478	16.4	2.7	53.4	3.5
	16	1 796.94	0.67	0.04	0.23	96.4	36.8	18.8	17.5	233	414	8.8	2.0	51.9	3.5
	17	1 798.55	0.75	0.04	0.27	92.5	26.4	23.6	27.9	229	477	14.1	2.2	57.5	3.7
	18	1 798.57	0.66	0.04	0.22	113.0	31.3	24.4	26.1	241	462	15.7	2.8	51.7	3.8
	19	1 798.62	0.38	0.03	0.18	101.0	56.8	22.4	27.0	222	726	10.0	2.6	64.2	3.9
	20	1 798.67	0.38	0.03	0.16	82.6	30.1	20.3	21.8	239	578	11.1	2.0	53.8	3.2
	21	1 798.73	0.47	0.03	0.24	78.5	33.3	16.8	19.6	237	573	10.3	2.8	52.6	3.6
	22	1 798.78	0.58	0.04	0.19	75.3	32.0	19.8	24.7	224	534	11.0	2.1	60.2	3.7
广 7 井	23	2 013.22	1.89	1.81	7.59	73.4	111.0	16.5	36.5	222	561	10.3	2.3	47.2	2.5
	24	2 013.79	0.68	0.04	0.25	89.4	32.8	23.8	23.9	207	477	15.6	2.2	48.7	3.1
	25	2 013.98	1.34	0.29	0.94	103.0	60.5	19.5	44.5	177	417	13.3	2.2	51.9	2.6
	26	2 014.30	0.83	0.07	0.40	84.0	46.4	21.9	23.7	203	453	12.9	1.8	50.7	2.9
	27	2 014.62	0.92	0.05	0.38	94.3	70.2	13.3	35.6	211	421	13.6	2.0	45.2	2.9
	28	2 014.94	0.85	0.06	0.32	80.0	52.3	15.9	23.9	185	500	13.0	2.2	42.2	3.6
	29	2 015.26	0.60	0.04	0.30	93.2	46.9	22.1	27.7	209	476	12.8	2.9	49.9	3.0
	30	2 015.58	1.53	0.05	0.63	104.0	44.9	16.8	31.9	198	435	14.7	2.5	52.4	3.3
	31	2 015.90	0.62	0.04	0.32	82.6	26.2	19.7	21.4	197	477	12.6	2.8	55.7	3.1
	32	2 017.58	0.74	0.05	0.84	94.5	26.8	12.6	17.2	315	308	7.5	2.2	77.2	4.5
	33	2 017.90	0.57	0.12	0.44	91.1	27.0	11.5	16.3	202	275	7.9	1.3	35.3	2.6

Table 5

Fig. 6

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层位	频数	频率/%
阜三段1小层	191	91.83
阜三段2-1小层	12	5.77
阜三段2-2小层	3	1.44
阜三段3小层	2	0.96
阜三段4小层	0	0
合计	208	100.00

层位	地层平均孔隙度/%
层位	中砂岩	细—粉砂岩	泥岩
阜三段2小层	22.98	14.87	6.64
阜三段3小层	24.94	15.60	7.86
阜三段4小层	27.90	15.95	6.99

层位	地层恢复平均孔隙度/%
层位	中砂岩	细—粉砂岩	泥岩
阜三段2小层	30.79	33.55	27.34
阜三段3小层	32.79	34.87	31.24
阜三段4小层	34.36	35.36	30.02

层位	地层压实率/%
层位	中砂岩	细—粉砂岩	泥岩
阜三段2小层	25.37	56.68	75.71
阜三段3小层	23.95	55.26	74.84
阜三段4小层	18.80	54.89	76.72

Sedimentary palaeogeomorphology and palaeo-environment reconstruction of shallow water delta in the 3rd member of Funing Formation in Qintong Sag, Subei Basin

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