南堡凹陷无井探区烃源岩评价研究
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摘要
根据南堡凹陷海域地区钻井少给烃源岩评价和资源量计算带来较大困难的实际情况,研究了该凹陷沉积相与有机质丰度、类型的关系,通过无井探区的地震地层学的沉积相研究成果,预测南堡凹陷蛤坨地区东三上段烃源岩的有机质丰度高(有机碳平均为1.14％,生烃潜量为4.92mg/g)、类型好(Ⅱ_1型干酪根)、已进入成熟阶段,综合评价为好烃源岩。东三下段烃源岩有机质丰度和类型与东三上段的各项参数相近,处于生烃高峰阶段,综合评价为好烃源岩。东二段乖口东一段评价为较差烃源岩。根据南堡凹陷不同层段的暗色泥岩颜色与有机碳的关系,提出灰黑、黑色泥岩的达标率为72.5％,灰、褐灰色泥岩为47.6％,灰、浅灰色泥岩为55.6％。图4表7参10
There are few exploratory wells in offshore of the Nanpu Sag, which brings difficulty to the source rock evaluation and reserves calculation. The organic abundance and kerogan type in the Dongying Formation of Hatuo area of Nanpu Depression could be evaluated by using the seismic stratigraphy. The source rock in the Ed_3~1 is a good one because its higher organic abundance (TOC 1.14%, S_1+S_2 4.92mg/g),and type Ⅱ_1 kerogan at a mature stage. The source rock in the Ed_3~2 has similar parameters (TOC 0.99%;S_1+S_2 4.36mg/g;type Ⅱ_1 kerogan), has been in peak stage for generating hydrocarbon, and is also evaluated to be good source rock, and the source rocks in the Ed_2 are evaluated to be bad source rocks. According to different colors of dark mudstone,the TOC qualification rates are counted at different intervals (TOC qualification rate; No 12, 72.5%; No13,47.6%; No 14,55.6%).
There are few exploratory wells in offshore of the Nanpu Sag, which brings difficulty to the source rock evaluation and reserves calculation. The organic abundance and kerogan type in the Dongying Formation of Hatuo area of Nanpu Depression could be evaluated by using the seismic stratigraphy. The source rock in the Ed_3~1 is a good one because its higher organic abundance (TOC 1.14%, S_1+S_2 4.92mg/g),and type Ⅱ_1 kerogan at a mature stage. The source rock in the Ed_3~2 has similar parameters (TOC 0.99%;S_1+S_2 4.36mg/g;type Ⅱ_1 kerogan), has been in peak stage for generating hydrocarbon, and is also evaluated to be good source rock, and the source rocks in the Ed_2 are evaluated to be bad source rocks. According to different colors of dark mudstone,the TOC qualification rates are counted at different intervals (TOC qualification rate; No 12, 72.5%; No13,47.6%; No 14,55.6%).
引文
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[3] 刘蕴华,周海民,等.南堡凹陷的含油气系统分析[J].石油与天然气地质,2000,21(4) :364-365．
[4] 谭丽娟,田世澄.南堡凹陷油气运移特征及成藏动力学系统划分[J].石油勘探与开发,2000,27(5) :16-18．
[5] 周海民,汪泽成,郭英海.南堡凹陷第三纪构造作用对层序地层的控制[J].中国矿业大学学报,2000,29(3) :326-330．
[6] 袁选俊,薛叔浩,王克.南堡凹陷第三系沉积特征及层序地层学研究[J].石油勘探与开发,1994,21(4) :87-95．
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[10] 徐龙,王振奇,张昌民,郭宏莉.南堡凹陷下第三系储层特征及其影响因素[J].1994,16(2) :21-26．
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