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

摘要/Abstract

摘要：

古地貌、古环境条件是影响沉积的主要外部因素，苏北盆地溱潼凹陷阜三段浅水缓坡三角洲由于水体变化频繁、地形复杂、地震识别追踪难度高，对其古地貌与古环境恢复研究仍较为欠缺，影响对研究区整体勘探评价。为明确溱潼凹陷阜三段沉积时期的古地貌及古环境条件，通过对地层岩心、测井资料、岩石物性资料进行综合分析，结合古地质图、印模法、残余厚度法等对阜三段沉积时期古地貌进行半定量恢复并优选2口井33个岩石样品的热解实验数据、TOC（总有机碳含量）及微量元素含量数据进行古环境恢复分析。据此绘制溱潼凹陷阜三段古地貌恢复图及古环境变化曲线，证明研究区阜三段是南低北高、东西收敛的箕状凹陷，沉积时期气候温暖潮湿，水体活动频繁往复，湖水盐度低，多物源多期次间歇供给，物源输入持续增多，沉积速率较快。明确了研究区地层物性参数与古地貌，地球化学参数与古环境的对应关系，从而为进一步勘探开发提供参考。

关键词: 古地貌恢复, 微量元素分析, 古环境恢复, 阜三段, 溱潼凹陷

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

中图分类号:

TE111

程浩,金振奎,余文端等. 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[J]. 油气藏评价与开发, 2023, 13(3): 368-378.

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.

图/表 11

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表3

表4

图5

表5

苏北盆地溱潼凹陷阜三段地层样品分析化验数据"

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

表5

图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