塔里木盆地孔雀1井志留系含气储层成藏期次研究

STUDIES OF ACCUMULATION STAGES OF SILURIAN GAS-BEARING RESERVOIRS IN WELL KONGQUE 1 IN THE TARIM BASIN

近年来，塔里木盆地东北缘烃源岩高-过成熟区油气勘探获得重要发现，已在几口井中获得工业气流或油气显示，位于孔雀河斜坡维马克-开屏构造带上的孔雀1气藏是其中一个代表性的重要气藏。通过流体包裹体实验法，探讨了孔雀1并志留系含气储层的成藏期次。实验结果表明，孔雀1气藏历史上主要有2期成藏过程：第一期为加里东晚期沉积埋藏阶段古油藏形成时期（380～365Ma）；第二期为构造抬升阶段，源于古油藏热裂解成因的天然气成藏期（325～315Ma）。对比英南2气藏的成藏时间可以看出，孔雀1气藏形成时间较早，早先建立起的孔雀河地区晚期成藏特点不具有普遍性，不同构造带具有不同的成藏历由特征．对孔雀河地区成藏所由取得的新认识，对该地区下一步油气勘探具有重要的指导意义。

Oil and gas explorations in the northeast of Tarim Basin are quite successful recently with several commercial gas accumulations discovered in high and over-matured source region. The Kongque 1 （Kq 1） Gas Field, situated in the Weimake-Kaiping Structural Belt of the Kongquehe Slope, is a representative gas accumulation. With applications of organic inclusions, accumulation stages of Silurian gas-bearing reservoirs in Well Kq 1 are determined. According to experiment results, charge history of Well Kq 1 can be divided into 2 stages. The first stage is the formation time of palaeo-petroleum reservoir in depositional phase of late-Caledonian movement （350-365 Ma）. The second stage is the gas formation time during tectonic uplifting stage （325-315 Ma）. Gas is thermal cracked gas derived from palaeo- petro-leum reservoirs. Compared with accumulation time of Well Yingnan 2, formation time of Well Kq 1 is earlier. Late period accumulation characters in the Kongquehe area is not general. Different tectonic belts have different oil-and-gas accumulation histories. New cognitions about formation stages of oil-and- gas are important for further explorations in the Kongquehe area.