川东北元坝、马路背地区上三叠统须二段石英砂岩储层天然气产能差异的原因

发布时间：2018-04-19 09:16

本文选题：四川盆地 + 元坝地区　；参考：《天然气工业》2017年08期

【摘要】：元坝地区和马路背地区是四川盆地东北部(川东北)上三叠统须家河组二段的主要产气区,均为以石英滩坝相储层为主的岩性气藏,但二者的产能差异较大(前者低后者高)。为此,基于前人的研究成果和新收集的分析化验、地震剖面以及测录井资料,从沉积环境、储层成岩作用和成藏条件模式等方面入手,探讨了上述两个地区须二段石英砂岩储层天然气的富集高产稳产规律及差异性。结果表明:①尽管大巴山物源区提供的沉积物质、马路背地区的古地貌和水动力条件等均有利于可溶填隙物保存,马路背地区经历的强构造运动也有助于形成网状裂缝提高储层的连通性,但受制于岩石本身石英颗粒含量和造缝规模程度,沉积和储层成岩作用均不能成为上述两个地区须二段储层天然气聚集存在巨大差异的主要因素;②由于马路背地区存在断距大、纵深远的深源逆断层,不仅使得上覆须三段烃源层与须二段储层对接,还沟通了下伏海相烃源层,天然气可以沿侧向+垂向持续向石英砂岩储层运移,形成"双重供烃、立体输导"的复式成藏模式,这才是该区M101井实现天然气高产稳产的关键因素。
[Abstract]:The Yuanba area and the Lubei area are the main gas producing areas in the second member of the Upper Triassic Xujiahe formation in the northeastern Sichuan Basin (northeast Sichuan). They are lithologic gas reservoirs dominated by quartz beach and dam facies, but the productivity difference between the two is large (the former is low and the latter is high).Therefore, based on the previous research results and newly collected analysis and laboratory data, seismic profile and logging data, starting from the sedimentary environment, reservoir diagenesis and reservoir forming conditions model, etc.This paper discusses the regularity and difference of natural gas enrichment, high yield and stable production of quartz sandstone reservoir in the two areas mentioned above.The results show that although the sediment provided by the Daba Mountain source area, paleogeomorphology and hydrodynamic conditions in the back of the road area are favorable to the preservation of the soluble interstitial material,The strong tectonic movement experienced in the Lubei area also contributes to the formation of reticular fractures to improve reservoir connectivity, but is constrained by the quartz particle content and the fracture size of the rocks themselves.Sedimentation and reservoir diagenesis can not be the main factors that lead to great difference in gas accumulation in the second member of reservoir in the two areas mentioned above. 2. Due to the existence of deep thrust faults with large fault spacing and far-reaching longitudinal length in the Lubei area, the reservoir diagenesis can not be regarded as the main factor.It not only makes the hydrocarbon source bed of the third member of the upper overburden Shu interconnect with the reservoir of the second member of Xujie, but also communicates the underlying marine hydrocarbon source bed, and the natural gas can continuously migrate to the quartz sandstone reservoir along the lateral vertical direction, thus forming a "double hydrocarbon supply, three-dimensional transport" complex reservoir formation model.This is the key factor to realize high and stable natural gas production in M 101 well in this area.
【作者单位】：中国石油化工股份有限公司勘探分公司;
【基金】：国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”(编号:2016ZX05002004)
【分类号】：P618.13

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