收稿：2020-10-19，
纸质出版：2021-08-28
移动端阅览
川东北元坝地区须家河组三级储量规模大，但储量探明率低、试采效果差。其主要原因是致密砂岩储层非均质性强，相对优质储层分布不明。因而采用了先精准预测砂砾岩，然后在砂砾岩中寻找相对优质储层的思路开展研究。在单井沉积微相划分基础上，通过岩性逐级识别，实现岩性准确解释；进而分析须家河组三段各砂组顶、底界面处岩性组合及其地震响应特征，明确地震剖面上波峰和波谷的地质含义，同时考虑井-震分层的差异，多方法确定提取地震属性时的合理时窗，进而提取相应范围内、不受上、下地层影响的多种地震属性，以钻井结果为比照，优选对砂砾岩最为敏感的地震属性，井-震结合，刻画须三段砂砾岩的展布。为了进一步搞清楚砂砾岩中相对优质储层段，应用岩心资料，对砂砾岩细分岩石相，明确了须三段发育中-粗粒钙屑砂岩和砂质细砾岩两类相对优质储层，建立其测井解释标准，在砂砾岩展布的约束下，精细刻画了两类相对优质储层的分布，为须三段气藏下一步规模有效开发奠定了坚实基础。
The 3P reserves of the Xujiahe Formation are large in scale in Yuanba area.However
due to the strong heterogeneity of tight sandstones
and less understanding on the distribution of relatively high-quality reservoirs
the proportion of proven reserves is low in the 3P reserves and the production tests are poor in effect.It is necessary to accurately predict the distribution of coarse siliciclastic rocks
from which relatively high-quality reservoirs are to be discovered.On the basis of sedimentary microfacies division by using well data
precise lithologic interpretation is achieved by gradual lithologic identification.The geological significance of peaks and troughs on seismic sections is clarified by analyzing the lithological associations on the top and bottom surfaces for various sand groups in the 3rd member of Xujiahe Formation (hereinafter referred to as Xu 3 Member); meanwhile
multiple methods are applied to select proper time window for extracting seismic attributes given the gap in seismic-well layering
and several seismic attributes that are not influenced by the overlying and underlying formations are extracted within the time window.In regard of the drilling data
we select the seismic attributes that are the most sensitive to coarse siliciclastic rocks and use them to map the distribution of the coarse siliciclastic rocks via seismic-well tie.On the other hand
to identify the relatively high-quality reservoirs within coarse siliciclastic rocks
we sub-divide the coarse siliciclastic rocks in lithology with core data
confirming that there are two categories of high-quality reservoirs well developed in the Xu 3 Member
that is
the medium-to-coarse-grained calcarenaceous sandstone reservoir and fine-grained arenaceous conglomerate reservoir.Furthermore
the distribution of the two categories of high-quality reservoirs is finely depicted under the constraint of the coarse siliciclastic rock distribution while establishing well logging interpretation criteria.The results serve to lay a sound basis for the large-scale development of the Xu 3 Member gas pools in high efficiency.
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