Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (3): 514-527.doi: 10.11743/ogg20220303
• Petroleum Geology • Previous Articles Next Articles
Shifa Zhu1,2(), Ye Jia2,3, Lichi Ma4, Dian Cui4, Anyu Jing4, Huan Tong1,2
Received:
2021-04-27
Revised:
2022-03-09
Online:
2022-06-01
Published:
2022-05-06
CLC Number:
Shifa Zhu, Ye Jia, Lichi Ma, Dian Cui, Anyu Jing, Huan Tong. Characteristics, quality-controlling factors and sweet spot model of the Mesozoic weathering crust reservoirs with complex lithologies in the Jiyang Depression, Bohai Bay Basin[J]. Oil & Gas Geology, 2022, 43(3): 514-527.
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Table 1
Composite classification of the Mesozoic buried?hill reservoirs of complex lithologies in the Jiyang Depression, Bohai Bay Basin"
结构大类 | 成分大类 | 基本岩石类型 | 识别标志 | 代表井 | 对应层段 | |
---|---|---|---|---|---|---|
陆源碎屑岩 (压实固结和水化学物胶结) | 碎屑结构 | 陆源碎屑物质 | 砾岩 | 常见于冲积扇、辫状河和辫状河三角洲河床底部滞留沉积,砾石常呈定向排列;冲积扇砾岩中泥砾常见,多为撕裂屑;中性凝灰质为杂基或岩屑 | 孤南40、富9 | 西洼组 |
孤北107 | 蒙阴组 | |||||
高41、高41-1 | 西洼组、 蒙阴组 | |||||
(杂)砂岩 | 冲积扇:岩石分选、磨圆差,不明显的交错层理、块状层理发育,镜下为杂基支撑,磨圆差,面孔率低; 辫状河:砂体平面上带状分布,分流河道、分流河道间沉积发育,具有洪泛性越岸沉积组合,薄片下分选中等,颗粒呈次棱角状-次圆状; 辫状河三角洲:岩石分选较好,平行层理、板状、槽状交错层理发育,常见冲刷面构造 | 桩33、桩205、富9 | 西洼组 | |||
桩古35、桩107-1、 孤北33 | 蒙阴组 | |||||
高41、高56 | 西洼组、 蒙阴组 | |||||
桩181、桩斜208、 桩古22、胜海8、 埕北301、孤南31 | 三台组 | |||||
埕北306 | 蒙阴组、 三台组 | |||||
粉砂岩 | 发育于辫状河的分流河道间、辫状河三角洲前缘的支流间湾;孤西潜山带样品中含有凝灰质 | 垦古55 | 坊子组 | |||
高41、高41-1、高56 | 西洼组 蒙阴组 | |||||
火山熔岩 (基质中分布的火山碎屑含量<10 %, 冷凝固结) | 熔岩结构 | 中性 (SiO2 52 %~63 %) | 安山岩 | 斑状结构,气孔被后期充填具杏仁构造;斑晶矿物有辉石、角闪石、黑云母、斜长石,斜长石呈自形宽板状 | 富111、孤南41、 高41、桩98、桩22、 桩斜22、老30 | 西洼组 |
基性 (SiO2 45 %~52 %) | 玄武岩 | 矿物组成包括中、基性斜长石、角闪石、黑云母、辉石,具自碎角砾结构 | 富117、富121、高56 | 西洼组 | ||
自碎角砾 结构 | 各成分均可形成 | 自碎角砾熔岩 | 矿物组成包括中性斜长石、角闪石、黑云母、辉石,具自碎角砾结构 | 孤南217、富111 | 西洼组 | |
火山碎屑岩 (火山碎屑含量>90 %, 压实固结) | 火山碎屑 结构 | 中性 (SiO2 52 %~63 %) | 凝灰岩 | 超过半数粒径小于2 mm,部分可见层理,具有凝灰结构;矿物包括中、基性斜长石、角闪石、黑云母、辉石 | 孤南40、富121、 高41、高41-1、 高56、桩斜22 | 西洼组 |
火山 角砾岩 | 由大于2 mm的火山角砾组成,分选很差,呈棱角状 | 孤南40、富121、 桩古35、桩斜22、老30 | 西洼组 | |||
次火山岩 (冷凝固结) | 结晶结构 | 暗色脉岩类 | 煌斑岩 | 富含云母,暗色矿物含量高,具有煌斑结构;六边形角闪石斑晶直径几十微米,自形程度高 | 孤南26、富29 | 西洼组 |
浅色脉岩类 | 闪长玢岩 | 灰白色,半自形粒状,斑状结构,斑晶为斜长石,矿物成分包括斜长石、碱性长石、黑云母、石英;斜长石半径颗粒自形程度高,直径可达几十微米 | 孤北古1 | 三台组 | ||
孤南138、富291 | 西洼组 | |||||
隐爆角砾 结构 | 脉岩类成分 | 隐爆 角砾岩 | 隐爆角砾结构,岩石原地破碎,角砾边缘呈棱角状,具有可拼合性,角砾间缝隙被后期热液充填 | 孤南217,富29 | 西洼组 | |
侵入岩 (冷凝固结) | 辉长结构、 辉绿结构 | 基性 (SiO2 45 %~52 %) | 辉长岩 | 辉石颗粒粗大、自形程度高,位于长石构成的三角形格架中 | 高41、高41-1、高56 | 西洼组 |
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