The Shunan Jialingjiang Group Reservoir Prediction Study

Drilling and geological research in recent years indicate that Sichuan Province south area Trias jialinjiang group have fracture - porous type reservoir distribute, while forming- the condition that the middle or small-scale equipped gas reservoir hides. With the discovery of middle or small-scale equipped gas field like Mlc field, Yb, Tf field, Mjp etcs, make jialingjiang group become new exploration focal point on Sichuan Province south district. But question that run into in exploring , the reservoir rates is 100% on expert layer well in 2001 Sichuan Province south area jialingjiang group, majority layers of well obtain industrial airflow in jialingjiang group , test except a few well output reach 5 X 104 m3/d getting above among them specially, other well produces relatively little to test;In addition, the reservoir thin of jialingjiang group is a difficult problem when we face in predicting thickness. This research is on the basis of geological research and drilling achievement already made, combine new technology, new method and new train of thought, proceed from well drilling , further investigate jialingjiang group logging, seismology respond characteristic, solves technological method that predict to jialingjiang group thin, in order to determine whether the reservoir or not ,but also to solve layer 's quantity problem , predict accurately quality of layers, divide the high yield area of gas reservoir. Especially solve the problem that predict vertical resolution ratio in the course of predicting.On this Research we choose Maliu field and Eli field structuce to predict, the research achievement make as follows.1. Utilizing the comprehensive research of geology, log well, seimsmology we thought, jialingjiang group semismology respond characteristic show as the low wave impedance mainly. when thereservoir fill with fluid ,speed and density will decline while the seismic wave is passed, the reservoir shows low wave-resistance characteristic , form bigger wave-resistance difference with wall rock, easy to identify, so seismi characteristic of reservoir mainly show as the low-resistance (low-speed ).2. Cause jialingjiang group reservoir have low wave -resistance characteristic , we utilize wave -resistance skill to predict .identify reservoir through low wave -resistance characteristic at first ,then predict reservoir thickness, finally predict the reservoir 's quality through porous inversion tecnology.3. Jialingjiang group dolomite (limestone) rock reservoir under the flod and fault function, lith pure and have some porous reservoir, easy to produce the effective fault crack, this kind geological characteristic of reservoir show as the straight difference at electricity curve of LLD and LLS . Utilize inversion technique of LLd and LLs to research reservoir permeability in jialingjiang group.4. Perform positive-model study , proved the precision of seismic inversion technique can meets predicted requests on jialingjiang group.5. Through study , summarize one set of identify and prediction technology of reservoir on Jialingjiang group Sichuan Province south area , through well drilling verify that predict achievement is better accord with known geology. So we think that catch dolomite (limestone)rock low wave -resistance characteristic of reservoir , combine straight difference characteristic of LLd and LLS, use multi-attribute seismic inversion technology to look for favorable reservoir is one of the availability method on Jialingjiang group of Sichuan Province south area.