High Precision Paleotopography Restoration Technology and Its Application:Taking the Second Member of Dongying Strata in the South of Liaoxi Uplift as an Example

Abstract

Abstract:

Large scale of lithological-overlap traps are developed in the second member of Dongying Formation in the south of Liaoxi uplift. Development degree and distribution of reservoir are the major factors controlling oil and gas accumulation in the study area. In areas of low exploration prospects, high-precision restoration of ancient landform is utilized in each oil group units. Based on restoration of denudation, burial depth and seismic respondence features, primary strata thickness is restored. Paleo-water depth is recovered via lithology, sedimentary facies and seismic reflection. Through quantitative analysis of cross-section area and extending length of valleys, ancient landform of three kinds of incised valleys are recognized. The gradient of ancient landform, cross-section area and sand transporting capacity are reduced from V-shape, U-shape to W-shape incised valley respectively. Shapes and locations of valleys in different periods control development of sedimentary systems. We elaborately depict reservoir distribution and sedimentary evolution features in different periods.

Key words: Liaoxi uplift, ancient landform, valley, sedimentary system

CLC Number:

TE122.2

WANG Chenjie, HUANG Xiaobo, GUO Tao, XIE Jing, GUO Rui, YAO Cheng. High Precision Paleotopography Restoration Technology and Its Application:Taking the Second Member of Dongying Strata in the South of Liaoxi Uplift as an Example[J]. Geoscience, 2017, 31(06): 1214-1221.

Figures/Tables 13

References 20

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油组	LD10-1-A2				LD10-2-A1				LD16-1-A1
油组	恢复厚度/m	现今厚度/m	压实率		恢复厚度/m	现今厚度/m	压实率		恢复厚度/m	现今厚度/m	压实率
零	111.88	66.02	0.411 7	53.11		29.23	0.453 6	76.78		45.06	0.415 2
Ⅰ	211.89	129.35	0.390 2	84.28		54.45	0.359 0	293.77		179.32	0.390 2
Ⅱ	161.27	92.25	0.428 5	183.07		125.21	0.315 1	140.72		90.19	0.359 0
Ⅲ	75.08	42.38	0.441 3	249.94		155.12	0.378 9	215.32		126.22	0.415 2
Ⅳ	118.47	65.12	0.450 5	114.57		68.15	0.404 8	65.11		38.16	0.414 9

油组	LD10-1-A2				LD10-2-A1				LD16-1-A1
油组	恢复厚度/m	现今厚度/m	压实率		恢复厚度/m	现今厚度/m	压实率		恢复厚度/m	现今厚度/m	压实率
零	111.88	66.02	0.411 7	53.11		29.23	0.453 6	76.78		45.06	0.415 2
Ⅰ	211.89	129.35	0.390 2	84.28		54.45	0.359 0	293.77		179.32	0.390 2
Ⅱ	161.27	92.25	0.428 5	183.07		125.21	0.315 1	140.72		90.19	0.359 0
Ⅲ	75.08	42.38	0.441 3	249.94		155.12	0.378 9	215.32		126.22	0.415 2
Ⅳ	118.47	65.12	0.450 5	114.57		68.15	0.404 8	65.11		38.16	0.414 9

油组	LD10-1-A2
油组	水深+恢复厚度/m	水深/m	恢复厚度/m
零	114.88	3	111.88
Ⅰ	213.89	2	211.89
Ⅱ	166.27	5	161.27
Ⅲ	79.08	4	75.08
Ⅳ	120.47	2	118.47
油组	LD10-2-A1
油组	水深+恢复厚度/m	水深/m	恢复厚度/m
零	58.11	5	53.11
Ⅰ	88.28	4	84.28
Ⅱ	188.07	5	183.07
Ⅲ	253.94	4	249.94
Ⅳ	117.57	3	114.57
油组	LD16-1-A1
油组	水深+恢复厚度/m	水深/m	恢复厚度/m
零	83.78	7	76.78
Ⅰ	302.77	9	293.77
Ⅱ	150.72	10	140.72
Ⅲ	223.32	8	215.32
Ⅳ	71.11	6	65.11

油组	LD10-1-A2
油组	水深+恢复厚度/m	水深/m	恢复厚度/m
零	114.88	3	111.88
Ⅰ	213.89	2	211.89
Ⅱ	166.27	5	161.27
Ⅲ	79.08	4	75.08
Ⅳ	120.47	2	118.47
油组	LD10-2-A1
油组	水深+恢复厚度/m	水深/m	恢复厚度/m
零	58.11	5	53.11
Ⅰ	88.28	4	84.28
Ⅱ	188.07	5	183.07
Ⅲ	253.94	4	249.94
Ⅳ	117.57	3	114.57
油组	LD16-1-A1
油组	水深+恢复厚度/m	水深/m	恢复厚度/m
零	83.78	7	76.78
Ⅰ	302.77	9	293.77
Ⅱ	150.72	10	140.72
Ⅲ	223.32	8	215.32
Ⅳ	71.11	6	65.11

沟谷类型	最大横截面积/m²	最小横截面积/m²	平均横截面积/m²
V	155 216	41 884	87 623
U	70 324	52 305	63 751
W	71 061	46 540	57 023
沟谷类型	最大延伸长度/m	最小延伸长度/m	平均延伸长度/m
V	4 186	1 456	2 470
U	2 890	851	2 039
W	1 486	1 050	1 198