Evaluation on Efficient Crushing Test in Deep Poor Drillability Formation

The ancient formation is very thick, strong abrasion and poor drillability. Formation pressure of some area is abnormal high-pressure, induced high mud density, and borehole instability problems in some formation restrict the positive displacement motor (PDM) application, and impact drilling tools are instable. All above factors restraint the rate of penetration. Based on the result of litho-mechanical experiments, the impacting experiments are performed on samples of the Jurassic formation, impact fractured efficiency are evaluated, the results show high impact resistance in the formation, the best impact speed is over 12m/s, and the result was important design basis for impact tools improvement to increase the rate of penetrate (ROP) in the deep poor drillability formation.

Jurassic Provenance System and Its Geological Implication in Altyn Piedmont, Qaidam Basin

A petroleum system originating from Jurassic source rocks exists in Altyn piedmont. However, the Jurassic formation in this system is deformed by Yanshan-Himalayan tectonic movement, and related studies about its spatial distribution and sedimentary system are still highly controversial. In general, a systematic research on the provenance system helps precisely restoring the prototype basin. Based on the methods of seismic characterization, sedimentary analysis, and detrital zircon U-Pb dating (samples from several Altyn piedmont outcrops), this paper studied the provenances of Jurassic formation in Altyn piedmont and characterized their distribution from different aspects: (1) Lacustrine rift basin developed in the study area at early Jurassic, while the formation showed a saucer shape with its thickness decreasing and vanishing towards the center of the basin in the middle Jurassic; in summary, the Jurassic formation in Altyn piedmont could be divided into several parts due to their different characteristics in different periods. (2) The south part of the Jurassic deposition (south of Qingshuigou) could come from the east Kunlun terrain; the middle part (Yueya mountain to Dongping area) however could be from several provenances, including the east Kunlun terrain, the surrounding plutons, and the Altyn fault; the north part (Niudong to north Lenghu area) is mainly related to the Altyn fault. (3) The Altyn fault, a regional fault system containing several strike-slip faults, is highly active since late Triassic and controls the current spatial distribution of the Jurassic formation; the faulted area in the piedmont could be separated into several parts with several different sources. (4) Compared to the southern and middle parts, the northern Jurassic deposition is relatively flat and contains wider and thicker source rock beds, which makes this area an important gas exploration target.