| 引用本文: | 杨平, 陈杨, 冯伟明, 牟必鑫, 魏洪刚, 客昆, 刘家洪, 何磊.西昌盆地白果湾组致密砂岩油气形成关键指标评价与有利区优选[J].沉积与特提斯地质,2021,41(3):454-464.[点击复制] |
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| 西昌盆地白果湾组致密砂岩油气形成关键指标评价与有利区优选 |
| 杨平,陈杨,冯伟明,牟必鑫,魏洪刚,客昆,刘家洪,何磊 |
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(1. 中国地质调查局成都地质调查中心, 四川 成都 610081;
2. 四川省煤田地质工程勘察设计研究院, 四川 成都 610072) |
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| 摘要: |
| 综合钻井、大量实测剖面、样品测试分析和区域地质资料，对西昌盆地白果湾组烃源岩生烃强度、镜质体反射率、砂岩储层物性等关键指标进行了系统评价。西昌盆地上三叠统白果湾组主要油气储层类型为中-粗砂岩，有利层段主要发育在白果湾组一段、三段和四段，砂岩具有中孔低渗、区域分布广、厚度大等特征，ZD-1井揭示砂岩含油气性好。西昌盆地白果湾组烃源岩在盆地中心厚度大，盆地中心的生烃强度达（56.74~97.70）×108 m3/km2。烃源岩成熟度（RO）在1.08%~3.98%范围，具有东低西高的特征。通过综合分析西昌盆地油气形成的关键指标，优选了夹铁-四开致密砂岩油气成藏有利区和4个甜点区，该区生烃强度（10~80）×108m3/km2，RO为1.08%~3.0%，中-粗砂岩厚度为10~50m，天然气资源量为6756×108m3，可形成"改造再重建"致密砂岩油气藏。 |
| 关键词: 西昌盆地 白果湾组 致密砂岩 储层 生烃强度 镜质体反射率 有利区 |
| DOI：10.19826/j.cnki.1009-3850.2021.04001 |
| 附件 |
| 投稿时间：2021-01-26修订日期：2021-04-07 |
| 基金项目:四川省页岩气产业基金项目“四川省页岩气调查评价”子项目“西昌盆地页岩气资源调查评价及区块优选”（编号：510201201712929）、中国地质调查局项目（DD20160193、DD20160176）和国家重大科技专项项目（2016ZX05034004）联合资助 |
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| Key indexes for hydrocarbon formation of tight sandstones and favorable areas of Baiguowan Formation in Xichang Basin |
| YANG Ping, Chen Yang, FENG Weiming, MOU Bixin, WEI Honggang, Ke Kun, LIU Jiahong, HE Lei |
(1. Chengdu Center, China Geological Survey, Chengdu 610081, China;
2. Sichuan Institute of Coal Field Geological Engineering Exploration and Designing, Chengdu 610072, China) |
| Abstract: |
| Based on existing drillings, a large number of outcrop profiles, and test data of samples, the indicators related to hydrocarbon formation such as hydrocarbon generation intensity,vitrinite reflectivity and sandstone reservoir of Baiguowan Formation in Xichang Basin are evaluated. The main hydrocarbon reservoir type of the Upper Triassic Baiguowan Formation in Xichang Basin is medium-coarse sandstones. The dessert sections are mainly the first, the third and the fourth Members of Baiguowan Formation. The sandstones have the characteristics of medium porosity, low permeability,wide regional distribution, and large thickness. The sandstones have good hydrocarbon properties in Well ZD-1. The source rocks of Baiguowan Formation in Xichang Basinare with a large thickness in the center and a thinning thickness in the edge. The hydrocarbon generation intensity is 56.74×108m3/km2 to 97.70×108m3/km2 in the basin center. The regional vitrinite reflectivity (RO) is between 1.08% and 3.98%, which is lower in the eastern basin and higher in the western basin. The Jiatie-Sikai tight sandstone hydrocarbon favorable accumulation area and four dessert areas are comprehensively optimized. The hydrocarbon generation intensity is 10×108m3/km2to 80×108m3/km2, the RO is 1.08% to 3.0%, the thickness of medium-coarse sandstone is 10m to 50m, while the natural gas resource is 6756×108m3, which can form the tight sandstone reservoir of "modification and reconstruction" type. |
| Key words: Xichang Basin Baiguowan Formation tight sandstones reservoirs hydrocarbon generation intensity vitrinite reflectivity favorable areas |