曲率属性在川西新场地区裂缝检测中的应用

Application of seismic curvature attribute to fracture prediction in Xinchang area,western Sichuan Depression

(1.中国石油化工股份有限公司多波地震技术重点实验室,四川德阳618000；2.中国石油化工股份有限公司西南油气分公司勘探开发研究院德阳 分院,四川德阳618000)

Kong Xuanlin,Key Laboratory of Multi Components Seismic Technology,Deyang 618000,China

川西凹陷新场气田深层须家河组气藏具有埋藏深、超高压、超致密、低孔隙度和低渗透率的特点,属于典型的裂缝型气藏。裂缝检测是新
场气田深层须家河组气藏勘探开发过程中急需解决的技术难题之一。针对现有裂缝检测技术在实际应用过程中存在的局限性和多解性,研究了一
种实用的地震属性——曲率属性,将该属性应用于川西凹陷新场地区XC区块的裂缝检测,弥补了相干属性在该地区检测裂缝时的不足。实际应用
效果表明,曲率属性在川西地区的裂缝检测结果与实钻结果吻合程度高,检测裂缝的尺度比相干体属性要小,且在解决高相干地区裂缝检测问题方
面优势明显,是一种值得深入研究和推广应用的裂缝检测属性。

The gas reservoir of deep Xujiahe Formation in Western Sichuan Depression is a typical fractured gas reservoir,which is
characterized by deep-buried,extra-high pressure,extra tight,low porosity and permeability.Fracture detection is one of the
technical difficulties to be urgently solved in exploration and development in this area.Aiming at the limitation and multi-
solution problems of the conventional fracture prediction methods,we studied the curvature attribute that is a practical
seismic attribute.The curvature attribute was applied on the fracture detection in XC Block of Xinchang area,Western Sichuan
Depression.Actual application result is coinciding well with drilling data.Meanwhile,the detection scale of curvature is
smaller than that of coherent cube attribute,which is more effective in high coherence area where coherence attribute may be
invalid.So,curvature attribute will be worth to be popularized and applied in fracture prediction.

10.3969/j.issn.1000-1441.2001.05.016