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四川盆地东部涪陵—巴南地区茅口组储层特征及预测
Predicting reservoir characteristics of Maokou Formation, Fuling-Ba'nan area, eastern Sichuan Basin
徐 姣 孙庆莉 段 杰 杨晋蓉 龚 立
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DOI:10.12055/gaskk.issn.1673-3177.2019.03.011
作者单位:中国石油东方地球物理勘探有限责任公司西南物探研究院
中文关键字:四川盆地 早二叠世 生物碎屑 岩溶 裂缝 地震反射特征 储层
英文关键字:Sichuan Basin; Early Permian; Bioclastics; Dissolution pore; Fracture; Seismic reflection characteristics; Reservoir
中文摘要:四川盆地南部下二叠统茅口组储层油气勘探开发历史较为久远,取得了丰硕的成果,其储集类型丰富多样。近年川西北部和川东地区二叠系勘探也获得了突破。而位于四川东南部的涪陵—巴南地区受不同方向的应力发育多组系构造,茅口组储层的储集类型、主控因素及展布特征是不清楚的,导致前期钻井虽有显示但产量不高。因此,通过分析川东涪陵—巴南勘探区内及邻区的钻、测井资料,进行茅口组古地貌特征研究、地震相分析及含油气异常的地震反射特征判别,识别出储层有利分布区。结果表明:①茅口组储层是富含生物碎屑、溶孔、裂缝的综合型储集层;②储层在地震剖面上具有“下拉式弱反射”、“眼球状”、“斜亮点”、“同相轴错断”、“同相轴分叉及合并”等特征;③储层分布横向变化较大,主要受古构造位置及断层展布控制;④探区西部古地貌位置较高,是岩溶较发育的有利区域,地震异常较为集中,具有良好的勘探潜力。
英文摘要:The reservoirs of Lower Permian Maokou Formation, southern Sichuan Basin, are of diverse types. Their exploration and development undergo a long time, and rich achievements have been obtained. Recently, Permian exploration has also been made breakthrough in northwestern and eastern basin. Especially in Fuling-Ba’nan area of eastern basin, it is found there are multiple structures developed with different-oriented stress. However, the reservoir types, main influencing factors, and distribution characteristics of Maokou Formation have not been made clear, resulting in lower production despite gas show discovered in the early drilling. So, some drilling and well-logging data of this area and neighboring areas was analyzed. Then, the palaeogeomorphic characteristics of Maokou Formation were investigated, the seismic facies was analyzed, and the seismic reflection characteristics of hydrocarbon-bearing anomalies were discriminated. At last, the distribution belt of favorable reservoirs was identified. Results show that (1) Maokou Formation is composite reservoirs containing abundant bioclastics developed with dissolution pores and fractures; (2) in seismic sections, these reservoirs represent the features of "push-down weak reflection", "augen", "oblique bright spot", "faulted event", and "event divergence and convergence"; (3) the reservoir distribution is characterized by considerably lateral change and mainly controlled by paleo-structure position and fault; and (4) the western study area, also higher palaeogeomorphic position in Fuling- Ba'nan area, is just a favorable one with more developed dissolution pores and seismic anomalies, also indicating stronger exploration potential.  
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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