一种基于岩石物理的烃检方法研究

地震反射是地层的响应,反射强度即振幅为地层界面反射系数与地震子波的褶积,反射系数是由上下岩层的阻抗差异所决定的,“亮点”形成正是由于上下地层存在较大阻抗差异。研究区目的层储层具有明显低阻抗特征,在地震上表现为“亮点”异常,为了减少“亮点”分析的多解性,在理论研究的基础上,确定泥气界面反射能量最强,气水界面次之,水泥界面最弱的基本规律。结合研究区已钻井进行岩石物理分析,分析储层含气、含水后各个界面地震振幅能量特征及相对关系,并且通过实际及等效模型进行正演模拟分析,对有利目标进行分析论证,最终经钻井证实方法的有效性。再对其影响因素进行详细研究分析,最后结合研究区自身油气成藏特征,总结归纳出适合该地区油气勘探工作中切实有效的烃检手段——振幅比值法烃检技术,为本地区有利目标的油气勘探提供了强有力的技术保障。

A study on hydrocarbon detection method based on rock physics

The seismic reflection is the formation of response, namely amplitude reflection intensity for stratigraphic reflection coefficient and the seismic wavelet deconvolution, the reflection coefficient is determined by the impedance difference of upper and lower strata of the "bright spots", formed because of upper and lower strata exist larger impedance difference. Objective reservoir research area is obviously low impedance characteristic, in the earthquake appears as "bright spot" abnormal ", in order to reduce the ambiguity of the bright spots" analysis, on the basis of theoretical research, determine the mud gas interface reflection the strongest energy, gas water interface times, the rule of cement interface the weakest group. Combined with the study area has been drilling of rock physics analysis, analysis of the gas bearing reservoirs, water after each interface seismic amplitude energy features and relative relationship, forward modeling analysis and through the practical and the equivalent model, analyzes the favorable target, finally the effectiveness proved by drilling method. Then the influence factors were analyzed in detail, finally the oil and gas accumulation characteristics, summarized suitable effective hydrocarbon detection method for oil and gas exploration in the area -- amplitude ratio method of hydrocarbon detection technology, provides a powerful technical support for local advantageous oil and gas exploration target.