塔北某区油气藏上方吸附丝指标异常模式研究

RESEARCH ON THE ANOMALOUS MODES OF ADSORPTION THREAD INDICATORS OVER THE HYDROCARBON RESERVOIR IN ONE REGION OF NORTH TALIMU BASIN

塔北某区油气藏是以深部古油气藏垂向运移调整和再聚集成藏为主的油气藏。在相同的近地表地球化学背景条件下 ,对该区已知油气藏上方吸附丝指标的数据采集、分析 ,并依据地区类推预测法和吸附丝反映深部油气烃类垂向微渗漏的动态信息特征 ,对石油地质条件相类似的预探区进行含油气性、油气属性的地球化学评价和预测。已知油气藏上方吸附丝指标的数据特征、相关聚类图、平面图、剖面图结果表明 :吸附丝指标较为有效地指示了下伏油气藏的存在。在KH1剖面上 ,吸附丝不同烃类指标浓度 (C2 -8、C13 -14 等 )的原始值、滤波值 ,以不同的异常模式较为有效地指示了已知油气藏 ;依据已知油气藏、预探区吸附丝指标数据特征、相关聚类图的对比 ,对预探区进行油气评价 ;依据已知油气藏剖面不同烃类指标的不同异常模式对钻探区进行预测 ,其结果被后期钻探成果所验证。

The formation of the hydrocarbon reservoir in one region of North Talimu Basin was mainly resulted from the vertical migration,adjustment and re-accumulation of the hydrocarbons coming from the deep-lying ancient oil and gas reservoir,Under the same near-surface geochemical background conditions,through collecting and analyzing the data on the adsorption thread indicators over the known hydrocarbon reservoirs in the region,the geochemical evaluation and prediction of the hydrocarbon potential and attribution were carried out for the preparatory area with similar petroleum geological conditions according to the anologized prediction method and the dynamic information features reflecting the vertical microleakage of the hydrocarbons coming from the deep-lying oil and gas reservoir by the adsorption thread indicators.In light of the data features,related cluster diagrams,horizontal plans and sectional drawings of the adsorption thread indicators over the known bydrocarbon reservoirs,it was concluded that the underlying hydrocarbon reservoir can be effectively indicated by the adsorption thread indicators.On KH1 section,the original and filtering values of the adsorption thread indicators of different bydrocarbon concentrations (C 2-8 and C 13-14 ,etc.)may indicate the known hydrocarbon reservoirs by distinct anomalous modes.The hydrocarbon potential evaluation may be carried out for the preparatory area through comparing the data features and related cluster diagrams of the adsorption thread indicators over the known hydrocarbon reservoirs with those in the preparatory area.The predicition was done for the drilling area in light of the distinct anomalous modes of different hydrocarbon indicators in known hydrocarbon reservoir sections and the results predicted was proved by later drilling achievements.