二连盆地宝勒根陶海凹陷烃源岩特征与资源潜力
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摘要
基于钻井、地震、测试分析等资料,对二连盆地宝勒根陶海凹陷烃源岩的分布和地球化学特征进行研究,并计算资源量。结果表明:宝勒根陶海凹陷烃源岩主要发育于下白垩统的腾二段、腾一段和阿尔善组,烃源岩累计厚度一般为600～1 200 m,优越的烃源岩条件为油气成藏奠定了良好的物质基础。腾二段烃源岩w(TOC)为1.96%～3.52%,为极好烃源岩;腾一段烃源岩w(TOC)为1.48%～6.49%,以好—极好烃源岩为主;阿尔善组烃源岩w(TOC)为0.49%～2.51%,主要为中等—好烃源岩。腾二段、腾一段和阿尔善组烃源岩干酪根类型均以Ⅱ_1型—Ⅱ_2型为主,但腾二段烃源岩更偏腐泥型,阿尔善组烃源岩更偏腐殖型。腾二段、腾一段和阿尔善组烃源岩R_o分别平均为0.48%、0.58%和0.78%,烃源岩成熟度整体较低,成熟烃源岩分布面积较小、且集中于北次凹洼槽带。宝勒根陶海凹陷的石油资源总量为4 483.14×10~4t,其中待发现石油资源总量为2 084.19×10~4 t,虽然待发现油藏的资源量构成以小油藏为主,但待落实资源量较大,研究区仍具有一定的石油勘探潜力。
Based on drilling,seismic and test analysis data,the distribution and geochemical characteristics of hydrocarbon source rocks in Baolegentaohai Sag of Erlian Basin were studied,and the resource quantity of the sag was calculated in order to determine its resource potential.The results show that the source rocks in Baolegentaohai Sag mainly develop in K_1bt_2,K_1bt_1 and K_1ba,and the cumulative thickness of the source rocks is generally 600～1 200 m,the good source rock conditions lay a good material foundation for hydrocarbon accumulation.TOC of source rock in K_1bt_2 is 1.96%～3.52%,and it is excellent source rock;TOC of source rock in K_1bt_1 is 1.48%～6.49%,and it is mainly good-excellent source rock;TOC of source rock in K_1ba is 0.49%～2.51%,and it is mainly medium-good source rock.The organic matter types of the source rocks in K_1bt_2,K_1bt_1 and K_1ba are mainly type Ⅱ_1-type Ⅱ_2,but the source rocks in K_1bt_2 are more partial sapropel type,the source rocks in K_1ba are more humic type.Theaverage R_o of source rocks in K_1bt_2,K_1bt_1 and K_1ba are 0.48%,0.58% and 0.78%,respectively,so the maturity of the source rocks in the study area is relatively low as a whole,and the distribution area of mature source rocks is small and they distribute mainly in the center of northern subsag.The total petroleum resources in Baolegentaohai Sag is 4 483.14×10~4 t,of which the total oil resources to be discovered are 2 084.19×10~4 t.Although the oil resources to be discovered is mainly in small oil reservoirs,but its amount is large,and the study area still has certain petroleum exploration potential.
Based on drilling,seismic and test analysis data,the distribution and geochemical characteristics of hydrocarbon source rocks in Baolegentaohai Sag of Erlian Basin were studied,and the resource quantity of the sag was calculated in order to determine its resource potential.The results show that the source rocks in Baolegentaohai Sag mainly develop in K_1bt_2,K_1bt_1 and K_1ba,and the cumulative thickness of the source rocks is generally 600～1 200 m,the good source rock conditions lay a good material foundation for hydrocarbon accumulation.TOC of source rock in K_1bt_2 is 1.96%～3.52%,and it is excellent source rock;TOC of source rock in K_1bt_1 is 1.48%～6.49%,and it is mainly good-excellent source rock;TOC of source rock in K_1ba is 0.49%～2.51%,and it is mainly medium-good source rock.The organic matter types of the source rocks in K_1bt_2,K_1bt_1 and K_1ba are mainly type Ⅱ_1-type Ⅱ_2,but the source rocks in K_1bt_2 are more partial sapropel type,the source rocks in K_1ba are more humic type.Theaverage R_o of source rocks in K_1bt_2,K_1bt_1 and K_1ba are 0.48%,0.58% and 0.78%,respectively,so the maturity of the source rocks in the study area is relatively low as a whole,and the distribution area of mature source rocks is small and they distribute mainly in the center of northern subsag.The total petroleum resources in Baolegentaohai Sag is 4 483.14×10~4 t,of which the total oil resources to be discovered are 2 084.19×10~4 t.Although the oil resources to be discovered is mainly in small oil reservoirs,but its amount is large,and the study area still has certain petroleum exploration potential.
引文
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