【摘要】：岔路河斷陷位于盆地的東北部,是盆地內(nèi)面積最大、油氣產(chǎn)量最高的斷陷,自西向東分布主要新安堡凹陷和波太凹陷。為了估算岔路河斷陷的油氣資源潛力,從油氣生成、運(yùn)移、聚集的成因角度出發(fā),采用化學(xué)動力學(xué)法,計(jì)算得到源巖中有機(jī)質(zhì)的生烴量,通過厘定排烴系數(shù)和聚集系數(shù),最終計(jì)算出研究區(qū)總的油氣資源量及油氣資源分布情況。首先,通過收集的鉆井、測井、地化等分析資料,從有機(jī)質(zhì)豐度、類型、成熟度三方面展開烴源巖的定性評價(jià)。然后依據(jù)干酪跟熱降解晚期生烴理論,選取主力生烴層的巖心樣品,在實(shí)驗(yàn)室條件下快速升溫條件下,模擬干酪跟地下生烴的過程,計(jì)算化學(xué)動力學(xué)參數(shù),結(jié)合重建的埋藏史、熱史模型,求取各層源巖中有機(jī)質(zhì)生烴量。最后,在已知生烴量的情況下,乘以排烴系數(shù)和聚集系數(shù),計(jì)算出該斷陷的總的油氣資源量。為了進(jìn)一步的指導(dǎo)油氣勘探,優(yōu)化計(jì)算結(jié)果,采用網(wǎng)格逼近法獲取油氣資源在平面上的分布數(shù)據(jù)。研究結(jié)果表明:雙陽組泥巖有機(jī)質(zhì)豐度高、類型好、成熟度高,奢嶺組泥巖次之,永吉組最差;新安堡洼槽在奢嶺組末永吉組初時(shí)開始有抬升,波太洼槽地溫梯度一直下降,直到齊家組開始才緩慢上升,兩個(gè)凹陷均維持在3℃/100m~4.5℃/100m之間浮動。岔路河斷陷資源量計(jì)算結(jié)果顯示,新安堡的主力生油層為雙陽組、奢一段和永二段,雙陽組、奢嶺組、永一段和永二段為波太的主力生油層。雙陽組、奢一段和永二段是岔路河斷陷中新安堡的主力生氣層,波太的主力生氣層為雙陽組、奢嶺組、永一段和永二段,且新安堡的生氣量要大于波太�？傮w看來,岔路河斷陷以生氣為主。最終的油氣資源評價(jià)結(jié)果顯示:本次評價(jià)較第三次評價(jià),石油資源量高出四倍,天然氣資源量超出近三十倍,這意味著該斷陷仍存在極大的勘探潛力。探討岔路河斷陷油氣資源潛量,為投資決策者的勘探部署提供有力的依據(jù)。
[Abstract]:The Chailuhe fault depression is located in the northeast of the basin. It is the fault depression with the largest area and the highest oil and gas production in the basin. It distributes mainly from west to east in Xinanbao depression and Botai depression. In order to estimate the potential of hydrocarbon resources in Chailuhe fault depression, from the origin of generation, migration and accumulation of oil and gas, the hydrocarbon generation of organic matter in source rock is calculated by using chemical kinetics method, and the hydrocarbon expulsion coefficient and accumulation coefficient are determined. Finally, the total amount of oil and gas resources and the distribution of oil and gas resources in the study area are calculated. Firstly, through the collected data of drilling, logging and geochemistry, the qualitative evaluation of source rocks is carried out from three aspects of organic matter abundance, type and maturity. Then, according to the late hydrocarbon generation theory of cheese and thermal degradation, the core samples of the main hydrocarbon generating layer are selected, and under the condition of rapid heating in laboratory, the process of hydrocarbon generation between cheese and underground is simulated, the parameters of chemical kinetics are calculated, and the buried history of reconstruction is combined. Thermal history model is used to calculate the hydrocarbon generation of organic matter in each source rock. Finally, when the hydrocarbon generation amount is known, the total oil and gas resources of the fault depression can be calculated by multiplying the hydrocarbon expulsion coefficient and the accumulation coefficient. In order to further guide oil and gas exploration and optimize the calculation results, the grid approximation method is used to obtain the distribution data of oil and gas resources on the plane. The results show that the mudstone of Shuangyang formation has high organic matter abundance, good type and high maturity, followed by Huiling formation mudstone, and Yongji formation is the worst, Xin'anbaodao trough began to uplift at the beginning of the late Yongji formation of the Hailing formation, and the geothermal gradient of the Botaiwa trough has been decreasing. It was not until the Qijia group began to rise slowly that the two cavities were kept between 3 鈩，

本文編號：2194282