To the heterogeneous property of Lunnan carbonate reservoir in Tarim oilfield, according to shape of operation curve and combining logging data, general situation of fractured reservoir can be judged.

This has been dubbed "sterilised" QE or "Operation twist", after a 1960s programme in which the Treasury and the Fed tried to "twist" the yield curve by altering the pattern of Treasury-bond issuance.

Previously available only through the curve plotting, edit node to map annotation box, not only operation trouble, it is hard to draw some special shapes.