| 常甜甜.银额盆地哈日凹陷油气成藏条件及成藏模式[J].地质与勘探,2022,58(4):905-916 |
| 银额盆地哈日凹陷油气成藏条件及成藏模式 |
| Hydrocarbon?accumulation?conditions?and?models?of?the Hari?sag in the Yingen-Ejinaqi?Basin |
| 投稿时间：2021-08-09 修订日期：2021-11-20 |
| DOI：10.12134/j.dzykt.2022.04.019 |
| 中文关键词: 烃源岩 岩性圈闭 成藏条件 成藏模式 哈日凹陷 银额盆地 |
| 英文关键词: source rock, lithologic trap, hydrocarbon accumulation condition, accumulation model, Hari Sag, Yingen-Ejinaqi Basin |
| 基金项目:陕西延长石油（集团）有限责任公司科技攻关项目（编号：ycsy2018ky-A-04）资助 |
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| 中文摘要: |
| 近年来，银额盆地哈日凹陷的油气勘探呈现出良好的态势，但对于哈日凹陷油气成藏条件相关研究甚少，已不能满足目前油气勘探开发的需求。本研究基于钻录井、地球物理、分析化验等资料，系统分析哈日凹陷油气成藏的烃源岩、储层、圈闭等条件，总结油气成藏条件配置关系，以期为哈日凹陷的后续油气勘探及地质研究提供依据。哈日凹陷主要发育三套烃源岩，其中银根组烃源岩有机质丰度极高，成熟度较低，有机质类型为Ⅰ-Ⅱ1型；巴二段烃源岩有机质丰度较高，成熟-高成熟，有机质类型为Ⅱ1-Ⅱ2型；巴一段烃源岩有机质丰度中等，成熟-高成熟，有机质类型为Ⅱ1-Ⅱ2型。储层类型为砂（砾）岩常规储层、碳酸质泥岩非常规储层和火山岩储层，且均属于特低孔超低渗储层，其中砂、砾岩储层和灰质泥岩储层物性最好，白云岩储层和火成岩储层次之，目前主力油藏主要集中在砂、砾岩储层和灰质泥岩储层这两种类型中。哈日凹陷主要发育两套岩性圈闭，即巴一段砂岩岩性圈闭和巴二段泥岩岩性圈闭，形成了源内（准）连续成藏模式和近源不连续成藏模式。 |
| 英文摘要: |
| In recent years, the Hari sag in the Yingen-Ejinaqi Basin has been explored with excellent hydrocarbon potential. The hydrocarbon accumulation conditions of this sag have been little documented, which cannot keep up with the present oil and gas exploration and development. Based on drilling and logging, geophysics, and laboratory test analysis, this study analyzed the source rocks, reservoirs and traps in detail, and further discussed the spatial configuration of hydrocarbon accumulation conditions in order to serve the subsequent oil and gas exploration and geological research in the Hari Sag. Three sets of source rocks were developed in the Hari Sag. The source rock of K1y has excellent organic matter abundance, low maturity, and contains organic matter type I-Ⅱ1; the source rock of K1b2 haS good organic matter abundance, maturity-high maturity, and contains organic matter type II1-Ⅱ2; the source rock of K1b1 has moderate organic matter abundance, maturity-high maturity, and contains organic matter type Ⅱ1-Ⅱ2. This sag possesses conventional sandstone (conglomerate) reservoirs, unconventional carbonated mudstone reservoirs, and volcanic reservoirs, which all belong to ultra-low porosity and ultra-low permeability reservoirs. Among them, sandstone, conglomerate reservoirs, and limestone mudstone reservoirs have the best physical properties, followed by dolomite and igneous reservoirs. At present, hydrocarbon is mainly stored in sandstone and conglomerate reservoirs, and lime mudstone reservoirs. There are two sets of lithological traps in the Hari sag, i.e., sandstone traps of K1b1 and mudstone traps of K1b2, which form the (quasi) continuous intra-source accumulation model and discontinuous near-source accumulation model. |
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