Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (3): 38-53.doi: 10.12108/yxyqc.20260304

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Hydrocarbon accumulation conditions and exploration implication of Archean metamorphic buried hill reservoirs in Binxian uplift, Dongying Sag, Bohai Bay Basin

HUO Aimin()   

  1. Binnan Oil Production Plant, Sinopec Shengli Oilfield Branch, Binzhou 256600, Shandong, China
  • Received:2025-12-24 Revised:2026-01-21 Online:2026-05-01 Published:2026-04-24

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Abstract:

By comprehensively utilizing technologies such as core observation, physical property testing, conventional logging, and imaging logging, reservoir formation conditions and hydrocarbon accumulation models of the buried hill in Binxian uplift of Dongying Sag in Bohai Bay Basin were systematically analyzed. Research results show that: （1） Archean reservoir types of Binxian uplift in Dongying Sag are fractured reservoirs and weathered crust reservoirs,with the weathered crust exhibiting a double-layer structure of dissolution layer and disintegration layer. Dissolution layers are mostly distributed in the lower part of the slope, making them optimal reservoirs. （2） The buried hill oil source of the study area comes from the third member of Shahejie Formation（Es3） and the fourth member of Shahejie Formation （Es4） source rocks in Lijin sub-depression, which has undergone two stages of hydrocarbon generation. The reservoir is dominated by weathered crust dissolution layers, with high-conductivity fractures and dissolution fractures as main reservoir spaces. Caprocks are thick dark mudstones of Es3 and Es4,with good sealing capacity. Migration pathways include two types: vertical migration along faults and lateral migration along unconformity surfaces. （3） The source-reservoir configuration relationship of buried hills in the study area has significant impacts on the reservoir formation. Paleogeomorphology and fracture density have controlling effects on reservoir quality. Faults and fractures are main migration channels for oil and gas. There are two types of oil and gas reservoirs,including “new source and old reservoir-lateral pinch out” type and “new source and old reservoir-buried hill top” type. The former is distributed in the central slope zone, where hydrocarbons migrate laterally from source rocks into buried hill reservoirs in contact with mudstones. The latter is distributed near large faults in the eastern slope zone, where oil and gas migrate vertically along faults to the top of the buried hill. （4） Compared with Shulu buried hill in Jizhong Depression, the study area exhibit an obvious double-layer structure of weathered crust, with lateral pinch out accumulation model as the dominant model and hydrocarbon properties being unitary. Five favorable zones are identified, among which Zone Ⅱ and Zone Ⅲ located in the central slope zone of the buried hill have optimal reservoir formation conditions and represent the most favorable exploration targets.

Key words: metamorphic buried hill, fractured reservoir, weathered crust reservoirs, source-reservoir configuration, new source and old reservoir, Archean, Binxian uplift, Dongying Sag, Bohai Bay Basin

CLC Number: 

  • TE122

Fig. 1

Tectonic location of Binxian uplift in Dongying Sag （a） and comprehensive stratigraphic column of well Shan 124（b）, Bohai Bay Basin"

Fig. 2

Burial-thermal history of Lijin sub-depression, Dongying Sag"

Fig. 3

Core photos of Archean buried hill gneiss in Binxian uplift， Dongying Sag"

Fig. 4

Fracture development characteristics of Archean buried hill gneiss core in well Shangu 6 （2 031~2 032 m） of Binxian uplift, Dongying Sag"

Fig. 5

Logging response characteristics of Archean buried hill gneiss reservoir in well Shangu 6 of Binxian uplift, Dongying Sag"

Fig. 6

Fracture features on imaging logging of Archean buried hill gneiss reservoir in well Shangu 6 of Binxian uplift, Dongying Sag"

Table 1

Statistics of relationship between fracture density and permeability of Archean buried hill of Binxian uplift, Dongying Sag"

井名 深度/m 裂缝密度/(条·m-1) 基质
渗透率/mD		 裂缝
渗透率/
mD		 渗透率
提高倍数/倍
单古6 1 983~2 074 8~12 1.0~5.0 20.0~50.0 4~10
单193 2 177~2 286 6~10 2.0~5.0 10.0~30.0 3~6
单古603 2 048~2 191 4~6 1.0~3.0 5.0~15.0 3~5
单古601 1 392~1 393 3~5 2.0~4.0 8.0~12.0 3~4
单古2 2 353~2 500 < 3 0.5~2.0 2.0~5.0 2~3

Fig. 7

Schematic diagram of double-layer structure of weathered crust in Archean buried hill of Binxian uplift, Dongying Sag"

Fig. 8

Vertical structure division of Archean buried hill weathered crust reservoirs in Binxian uplift, Dongying Sag"

Fig. 9

Well-tie profiles of Archean buried hill weathered crust reservoirs in Binxian uplift, Dongying Sag"

Fig. 10

Distribution of Archean buried hill weathered crust reservoirs in Binxian uplift, Dongying Sag"

Fig. 11

Development models of weathered crust reservoirs in the southeast slope of Archean buried hill in Binxian uplift, Dongying Sag"

Fig. 12

Distribution of mudstone caprock in Archean buried hill of Binxian uplift, Dongying Sag"

Table 2

Statistics of oil testing success rate of different caprock thickness zones in Binxian uplift, Dongying Sag"

盖层厚度/m 试油井数/口 成功井数/口 成功率/% 代表井
> 50 4 4 100 单古6
40~50 2 2 100 单193
30~40 3 2 67 单古603
< 30 2 0 0 单102

Fig. 13

Reservoir profiles of well Shangu 2-well Shangu 603-well Shangu 6-well Li 31 in the southeast slope of Archean buried hill of Binxian uplift, Dongying Sag"

Table 3

Oil testing statistics for oil producing wells in the slope zone of Archean buried hill in Binxian uplift, Dongying Sag"

井名 井段/m 射孔
厚度/m		 日产油/
t		 含水率/
%		 试油
结论
单古2 2 511.80~2 573.00 51.8 油花 100.0 含油水层
2 353.00~2 500.00 63.0 1.13 0 低产油层
单古603 1 931.81~2 037.00 105.2 — — 干层
2 167.57~2 248.00 80.4 — — 干层
2 048.00~2 191.00 6.0 2.77 41.9 油水同层
单古6 1 974.08~2 074.00 99.9 0.80 — 低产油层
2 539.18~2 636.00 96.8 — — 水层
2 519.37~2 545.41 26.0 — — 干层
1 974.08~2 071.71 97.6 7.74 37.4 油水同层
利31 2 246.00~2 253.00 7.0 6.40 — —
利古6 2 886.79~2 922.00 35.2 2.23 0 低产油层
2 893.79~3 190.20 296.4 油花 — 含油水层
2 893.79~3 051.11 157.3 油花 — 含油水层
2 893.79~2 987.24 30.0 2.21 — 低产油层
2 871.00~2 987.24 44.0 5.80 — 油层
单193 2 177.00~2 286.00 — 12.00 55.0 油水同层

Fig. 14

Reservoir type of “new source and old reservoir-lateral pinch out” of the southeast slope of Archean buried hill in Binxian uplift, Dongying Sag"

Fig. 15

Reservoir type of “new source and old reservoir-buried hill top” of the southeast slope of Archean buried hill in Binxian uplift, Dongying Sag"

Table 4

Comparison of hydrocarbon accumulation characteristics between Archean buried hill in Binxian uplift of Dongying Sag and Shulu buried hill belt in Jizhong Depression"

对比要素 束鹿潜山带 滨县凸起
成藏类型 “近源、断层输导、断背斜”
型油气藏
“远源、不整合输导、断块”
型油气藏		 “侧向尖灭”型油气藏
“潜山顶部”型油气藏
储层岩性 奥陶系碳酸盐岩
（泥晶白云岩、灰质白云岩）		 太古界片麻岩（斜长
片麻岩、钾长片麻岩）
储层特征 岩溶孔-缝-洞极为发育
渗透率大于100.0 mD		 风化壳双层结构
渗透率10.0~50.0 mD
储集空间 次生孔-洞-缝为主
裂缝网络连通性好		 高导缝和溶蚀缝为主
溶蚀层 + 崩解层组合
主控因素 断层和裂缝网络输导
多期油气充注		 古地貌和源-储配置
风化壳类型控制
油气性质 轻质油、重质油分异
密度0.757~1.062 g/cm³		 正常油，性质单一
API度25~35
成藏期次 2期充注 1期充注
保存条件 洼中隆好，斜坡带差 相对稳定

Table 5

Evaluation parameters of favorable zones in Archean buried hill reservoirs of Binxian uplift, Dongying Sag"

区带
编号		 高点
埋深/m		 面积/km2 有效
厚度/m		 单储系数/
（103 t·km-2·m-1）		 预测资源量/104 t
Ⅰ 1 400 1.4 20 3 8.4
Ⅱ 2 400 2.0 20 3 12.0
Ⅲ 1 800 1.8 20 3 10.8
Ⅳ 1 700 1.6 20 3 9.6
Ⅴ 2 800 0.5 10 3 1.5

Fig. 16

Favorable exploration zones of Archean buried hill reservoirs in Binxian uplift, Dongying Sag"

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