新场气田须家河气藏含气性地震检测研究

Seismic gas bearing detection in T₃x gas reservoirs in Xinchang Gas Field.

中国石油化工股份有限公司西南分公司物探研究院, 四川德阳618000

The Geophysical Prospecting Research Institute, Southwest Branch, SINOPEC, Deyang 618000, China

新场气田须家河气藏属于深层陆相致密碎屑岩气藏,具有致密、低孔渗、薄互层、多层叠置和强非均质性的特点。勘探成功率低、效果差。为此,针对须家河气藏开展了一系列方法研究,形成了一套针对此类气藏的含气检测技术——吸收速度频散(AVD)预测技术、动态能谱(DR)预测技术、瞬时子波能量吸收(WEA)预测技术、 Proni吸收滤波(PF)预测技术、储层频谱成像吸收梯度(AG)预测技术以及AVO反演属性(剪切模量μ、拉梅常数λ、泊松比σ)分析技术等。利用这套技术对须家河气藏进行了含气性检测,结果表明,含气砂岩储层具有高 AVD异常、高DR异常、高WEA异常、低PF异常、低AG异常、高μ异常、低λ异常和低σ异常等特征。因此, 综合应用这些异常特征信息,可以对非均匀致密砂岩进行含气性检测。

As a tight clastic rocks reservoir in deep land-fades strata, T3x gas reservoir is characterized by tightness, low permeability, thin inter-bed, multilayer nappe and high heterogeneity in Xinchang Gas Field. A series of seismic technologies for detection is developed, such as AVD(seismic absorption and velocity dispersion ), DR ( dynamic register ), WEA (wave energy attenuation), PF(Proni filter), AG (absorption grads) and the AVO attributes (Lame's modulus λ, the shear modulus μ and the Poisson ratio σ)analysis, etc. The testing results show that the characteristics of gas bearing sandstone in T3x are AVD, high DR, high WEA, low PF, low AG, high μ , low A and low σ, etc. By integrating above information, the gas bearing prediction to tight clastic rocks reservoir with heterogeneity can be achieved.