| 张云逸.越南兰龙盆地白虎油田储集层特征及成藏模式探讨[J].地质与勘探,2023,59(1):170-187 |
| 越南兰龙盆地白虎油田储集层特征及成藏模式探讨 |
| Reservoir characteristics and hydrocarbon accumulation models of the Bach Ho Oilfield in Cuu Long Basin, Vietnam |
| 投稿时间：2021-08-23 修订日期：2022-10-20 |
| DOI：10.12134/j.dzykt.2023.01.015 |
| 中文关键词: 储集层 基岩 成藏模式 白虎油田 兰龙盆地 越南 |
| 英文关键词: reservoir, bedrock, hydrocarbon accumulation model, Bach Ho Oilfield, Cuu Long Basin, Vietnam |
| 基金项目:国家自然科学基金项目“致密油储层人工裂缝网络形成机制及其流体多场耦合渗流理论研究”（编号：52074226）资助 |
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| 中文摘要: |
| 基于岩心、钻测井、三维地震和沉积相资料，对越南兰龙盆地白虎油田的碎屑岩、基岩储集层基本特征，以及对应的两种成藏模式进行综合分析。结果表明，白虎油田发育两类岩性储集层，即碎屑岩（砂岩）、花岗岩基岩储集层，其中碎屑岩储层在兰龙盆地基底地垒构造格架下沉积，受大地构造运动、海平面变化控制，以冲积扇、扇三角洲和河流相为主，在渐新统泥岩供烃的条件下形成了具有自生自储、下生上储特征的岩性、构造油藏。花岗岩的基岩裂缝、孔洞发育，具备优势的储集空间、储层规模大，成为最主力的储集层，成因为基底演化过程中的断裂活动、热液岩熔等作用。在花岗岩基岩储层中形成了两种成藏模式：一种以花岗岩无机成因自身含烃表现出原地成藏的特征；另一种上覆渐新统泥岩为富油烃源岩，沿断层、不整合面等侧向运移至基底顶部晚期聚集成藏，最终在基底中广泛发育裂缝、缝洞型基岩油藏。 |
| 英文摘要: |
| Based on core, logging data, seismic interpretation and sedimentary facies, this work analyzed the characteristics of clastic and basement reservoirs and the hydrocarbon accumulation models of the Bach Ho oilfield in Cuu Long Basin, Vietnam. Results show that this oilfield mainly includes two types of reservoirs, i.e., clastic and granite bedrock reservoirs. The clastic reservoir was deposited under the tectonic framework of basement horst in the Cuu Long Basin, which was controlled by tectonic movement and sea level changes. This type of reservoir was mainly composed of alluvial fan, fan delta and fluvial facies. With hydrocarbon supply from Oligocene mudstone, these lithologic and structural oil reservoirs were featured by self-generation and self-storage, and lower generation and upper reservoir. In contrast, granite bedrock reservoir was dominated by fractures and pores with good reservoir space and large reservoir scale, which has become the most important reservoir due to fault activities and hydrothermal rock melting during the basement evolution. The granite bedrock reservoir contains two main reservoir-forming models. One is inorganic origin with hydrocarbon stored in the bedrock. And the other reservoir-forming model is that, with overlying oil-rich source rocks of the Oligocene mudstone, the lateral migration of oil and gas along faults and unconformities led to hydrocarbon accumulation at the top of the basement. As a result, fractured and fracture-vuggy bedrock reservoirs were widely in the basement. |
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