鄂尔多斯盆地姬塬地区延长组6段油藏差异成藏因素

doi:10.11743/ogg20210509

Abstract

Abstract:

The 6^th Member of Yanchang Formation (Chang 6 Member) is a key target layer for petroleum exploration in Jiyuan area, Ordos Basin.The reservoirs of Chang 6 Member are characterized by large burial depth and complex oil-water contact, resulting in markedly differential distribution both vertically and laterally.In order to find out the factors causing the differential enrichment of reservoirs in the study area, we make a comparative analysis of the geological conditions based on core and casting thin section observation, formation testing, and geochemical analysis of inclusions and crude oil biomarker compounds.The results show that the key factors of differential enrichment are the source rock quality, type of sand bodies and physical properties of reservoirs.As a result, high-quality source rocks, favorable sand bodies and relatively high permeability, work in unison to generate the enriched zone of Chang 6 reservoirs.In the particular sedimentary environment, vertically speaking, the Chang 6¹ submember with the thickest sand bodies dominated by Type Ⅰ and in steady lateral distribution, features larger radius of throats, better physical properties, high hydrocarbon abundance in the reservoirs; in planar view, sand bodies developed in the east and west of the study area, feature large thickness, favorable type, less argillaceous interlayers, and better physical properties.In addition, source rocks have large thickness and strong hydrocarbon generation capacity, so they are favorable play fairways with favorable source-reservoir configuration.While the sand bodies of large thickness in central Jiyuan area are characterized by multiple beds thin for each single, multiple argillaceous interlayers, strong reservoir heterogeneity, and the source rocks are thin, so although the reservoirs therein are of better physical properties, their oil-bearing properties are poor, with most wells producing water.

Key words: enrichment factor, differential enrichment, reservoir distribution, Chang 6 Member, Yanchang Formation, Jiyuan area, Ordos Basin

CLC Number:

TE122.3

Baohong Shi, Xinyu Qin, Caili Zhang, Wen Liu, Gang Liu, Chanyuan Shi, Lei Zhang, Zishu Yong. Insights on factors causing differential enrichment of Chang 6 Member in Jiyuan area, Ordos Basin[J]. Oil & Gas Geology, 2021, 42(5): 1112-1123.

Figures/Tables 14

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Table 1

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试油井产量类别/t	孔隙度/%	渗透率/(10^-3 μm²)	含油饱和度/%	含水饱和度/%	产油量/(t·d^-1)	产水量/(m³·d^-1)
>20	12.47	1.04	33.24	32.09	23.37	0
10~20	12.00	0.83	29.29	38.35	11.60	1.22
4~10	11.93	0.79	24.57	40.10	5.59	5.22
0~4	11.83	0.59	22.40	43.70	1.17	9.67
产水井	11.71	0.55	21.54	44.79	0.03	16.35

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Insights on factors causing differential enrichment of Chang 6 Member in Jiyuan area, Ordos Basin

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