Hydrocarbon Accumulation Model and Quantitative Evaluation of Hydrocarbon Filling Capacity of Buried Hills in Jizhong Depression of Bohai Bay Basin
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摘要: 渤海湾盆地潜山油气资源量丰富,深化潜山油气成藏研究,定量评价潜山油气充注能力,对该盆地潜山油气勘探具有重要意义.以大量统计资料为基础,对渤海湾盆地冀中坳陷潜山油气成藏模式及充注能力开展了系统研究.研究表明:潜山油气成藏受烃源岩及供烃方式、储集特征、储盖组合等多种因素的控制,与烃源岩大面积直接接触的、长期风化淋滤的潜山储集体,最有利于油气成藏.研究区潜山油气藏分为高位潜山型、中位潜山型和低位潜山型大类;以任丘、苏桥、牛东1这3个典型潜山油气藏为代表,建立了高位、中位、低位3类潜山油气成藏模式.高位模式多分布于中央隆起带,具有“双向油源、源储对接”的特点;中位模式多分布于斜坡带,具有“侧向油源、复合输导”的特点;低位模式多分布于洼陷带,具有“顶部油源、不整合输导”的特点.综合考虑烃源岩生烃强度、潜山储层物性、供烃方式、储盖组合类型以及供烃窗口等多种潜山成藏主控因素,建立了潜山油气充注能力定量评价公式并对9个典型潜山油气藏进行了评价,3类潜山油气藏的油气充注能力明显不同,其中高位潜山油气充注能力最强,低位潜山次之,中位潜山最弱.Abstract: There are abundant oil and gas resources and great exploration potential in the buried hill of Jizhong depression in Bohai bay basin, and it is of great significance to deepen the study of hydrocarbon accumulation in buried hill and establish the quantitative evaluation formula of hydrocarbon filling capacity. Based on the analyses of the distribution of oil and gas accumulation and geological factors, combining previous research results, the buried hill in the study area is divided into high buried hill, middle buried hill and low buried hill. Represented by Renqiu buried hill, Suqiao buried hill and Niudong 1 buried hill, respectively, three models of hydrocarbon accumulation are established, namely high buried hill forming mode, middle buried hill forming mode and low buried hill forming mode. Among them, the high buried hill formation pattern is mostly distributed in the central uplift zone, which has the characteristics of "two-way oil source and source reservoir connection". The middle buried hill forming model is distributed in the slope zone, which has the characteristics of "lateral oil source and complex transmission". The low buried hill forming model is mostly distributed in deep concave zone and has the characteristics of "top oil source and unconformity transmission source rocks from the cover-flow backward filling". Considering the hydrocarbon-generation intensity of source rock, buried hill reservoir physical properties, assemblage type, hydrocarbon supply in buried hill and the influence of hydrocarbon-supplying window, a formula is established for quantitative evaluation of buried hill hydrocarbon filling capacity, and applied to the Jizhong depression, and the evaluation results show that the hydrocarbon filling capacity of three kinds buried hills is obviously different. The hydrocarbon filling capacity of high buried hill is the strongest, which is followed by the low buried hill, while that of the middle buried hill is the weakest.
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表 1 冀中坳陷潜山油气充注能力评价指标赋值标准
Table 1. Distributing criteria for evaluation index of hydrocarbon charging capacity in buried hills in Jizhong depression
评价指标 指标范围 赋值 指标范围 赋值 指标范围 赋值 指标范围 赋值 指标范围 赋值 指标范围 赋值 孔隙度(%) 0~5 4 5~10 6 10~15 8 15~20 10 渗透率(10-3μm2) 0~1 2 1~10 4 10~100 6 100~1 000 8 > 1 000 10 风化时间(WT)(Ma) A 9 B 8 C 7 D 5 E 4 F 3 供烃方式(HSP) Ⅵ 2 Ⅴ 3 Ⅳ 4 Ⅲ 8 Ⅱ 9 Ⅰ 10 储盖组合类型(SRM) Ⅰ 5 Ⅱ 10 Ⅲ 4 Ⅳ 2 生烃强度(105t/km2) 4 000~5 000 5 5 000~6 000 6 6 000~7 000 7 > 7 000 8 表 2 冀中坳陷潜山油气充注能力计算结果
Table 2. Calculation results of hydrocarbon charging capacity in buried hills in Jizhong depression
潜山类型 中央隆起带潜山(高位潜山) 斜坡带潜山(中位潜山) 洼陷带潜山(低位潜山) 典型潜山 任丘潜山 任北寒武 任北奥陶 苏桥潜山 刘其营潜山 龙虎庄潜山 肃宁潜山 河间潜山 牛东1潜山 孔隙度(%) 6.43 6 5.9 2 2.69 6 3 12 6.85 赋值 6 6 6 4 4 6 4 8 6 渗透率(10-3μm2) > 1 000 100~1 000 296 1~10 0.37 12 50 167 10~100 赋值 10 8 8 4 2 6 6 8 6 风化时间(Ma) B D E F F D B A B 赋值 8 5 4 3 3 5 8 9 8 供烃方式 Ⅰ Ⅲ Ⅲ Ⅴ Ⅵ Ⅵ Ⅴ Ⅲ Ⅱ 赋值 10 8 8 3 2 2 3 8 9 储盖组合类型 Ⅱ Ⅱ Ⅱ Ⅲ Ⅲ Ⅰ Ⅰ Ⅱ Ⅱ 赋值 10 10 10 4 4 5 5 10 10 供烃窗口(km) 2.16 0.54 1.29 0 0 0 0 0.11 2.73 生烃强度(105t/km2) 7 500 6 800 6 800 4 500 5 000 4 500 6 500 5 500 6 500 赋值 8 7 7 5 5 5 7 6 7 S 7.43 6.01 6.06 3.8 3.3 4.3 5.1 6.32 6.75 -
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