准噶尔盆地侏罗系煤系地层致密砂岩气资源潜力分析

发布时间：2018-08-07 13:43

【摘要】：中国西部侏罗系煤系非常规致密砂岩气资源潜力巨大,正成为未来一大勘探领域。准噶尔盆地作为西部最大含煤盆地,广泛发育侏罗系煤系,致密砂岩气勘探前景良好。盆地腹部中下侏罗统煤系致密砂岩气气源岩为中下侏罗统八道湾组与西山窑组煤系烃源岩,形成自生自储成藏组合,具深盆气特征,主要分布于埋深4 500~6 000m深度范围。煤系烃源岩与砂岩储集层多呈"上下"或"三明治"组合形式,表现出典型致密砂岩气藏储集砂体致密、普遍异常高压、气水关系复杂、产能较低、准连续规模分布特点。初步估算盆地侏罗系煤系致密砂岩气地质资源量为(13 630~11 740)×108 m~3,技术可采资源量为(6 140~5 280)×108 m~3;腹部侏罗系煤系致密砂岩气资源潜力大,勘探前景良好;主要勘探方向为围绕中央凸起带的(莫索湾—白家海凸起)南北两翼与构造结合部,以及西部车排子凸起南部倾没端、东部北三台凸起西南倾没端;有利勘探目标区为莫索湾凸起南翼、白家海凸起南翼、莫索湾—莫北凸起结合部东侧、莫索湾—白家海凸起结合部、车排子凸起沙门子鼻隆及北三台西泉鼻隆,下侏罗统八道湾组应为主要勘探目的层。
[Abstract]:The unconventional tight sandstone gas resource of Jurassic coal measures in western China has great potential and is becoming a major exploration field in the future. As the largest coal-bearing basin in the western Junggar Basin, Jurassic coal measures are widely developed, and the gas exploration prospect of dense sandstone is good. The gas source rocks of tight sandstone in the coal measures of the middle and lower Jurassic in the basin are the source rocks of the coal measures of the Badaowan formation and Xishanyao formation of the middle and lower Jurassic, forming the authigenic self-reservoir assemblage with deep basin gas characteristics, mainly distributed in the depth of 4 500 ~ 6 000 m deep in the buried depth. Most of the source rocks and sandstone reservoirs in coal measures are in the form of "up and down" or "sandwich" assemblages, which show that typical tight sandstone gas reservoirs have dense sand bodies, generally abnormal high pressure, complex gas-water relations, low productivity and quasi-continuous scale distribution characteristics. It is preliminarily estimated that the geological resources of tight sandstone gas in Jurassic coal measures in the basin are (13 630 0 11 740) 脳 10 8 mXi 3, the recoverable resource amount is (6 140 0 0 5 280) 脳 10 8 mXi 3, the gas resource potential of dense sandstone in Jurassic coal series in the abdomen is great, and the exploration prospect is good. The main exploration directions are the combination of the north and south wings and the structure around the central uplift (Mosuowan-Baijiahai uplift), as well as the southern dip end of the western Chepaizi uplift and the southwest dip end of the northern Santai uplift in the east; The favorable exploration target areas are the southern wing of the Mosuo Bay uplift, the southern wing of the Baijiahai uplift, the east side of the Mosuowan-Mobei uplift junction, the Moso Bay-Baijiahai uplift junction, the Chapaizi protruding Shamen Zizi uplift and the northern Santai Xiquan Beitong, The lower Jurassic Badaowan formation should be the main exploration target layer.
【作者单位】：中国石油天然气股份有限公司勘探开发研究院;中国石油新疆油田分公司勘探开发研究院;
【基金】：国家重大科技专项(编号:2011ZX05043) 中国石油天然气股份有限公司科技重大专项(编号:2013E-0502)联合资助
【分类号】：P618.13

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