| 东海盆地丽水凹陷有效烃源岩判定及分布预测 |
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| 引用本文： | 申雯龙,漆滨汶.东海盆地丽水凹陷有效烃源岩判定及分布预测[J].地质科技通报,2020,39(3):77-88. |
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| 作者姓名： | 申雯龙 漆滨汶 |
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| 作者单位： | 中海石油（中国）有限公司上海分公司 |
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| 基金项目： | 国家科技重大专项2016ZX05027-001-006 |
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| 摘 要： | 丽水凹陷作为东海陆架盆地具有较大勘探潜力的凹陷,其勘探程度较低,近年来钻探成果较小,因此亟需对烃源岩进行综合评价。通过烃源岩岩石热解实验,饱和烃气相色谱及饱和烃色质分析,对丽水凹陷烃源岩进行综合评价。结果表明,丽水凹陷烃源岩有机质类型以Ⅲ型为主,存在少量的Ⅱ1及Ⅱ2型。月桂峰组烃源岩处于成熟到过成熟阶段,灵峰组烃源岩处于成熟阶段,多数明月峰组烃源岩成熟度较低。根据烃源岩热解参数S 1及有机碳含量(TOC)的关系确定月桂峰组有效烃源岩w(TOC)下限为0.7%,灵峰组有效烃源岩w(TOC)下限为1.0%,明月峰组有效烃源岩w(TOC)下限为0.9%。生标参数显示丽水凹陷烃源岩有机质具有混合来源特征,沉积于海陆过渡环境中。有效烃源岩平面分布预测显示,丽水凹陷有效烃源岩的分布较为局限,丽水凹陷西次凹的东北部为有效烃源岩的集中分布区。月桂峰组及灵峰组烃源岩具有较大的产气潜力,应加大丽水凹陷西次凹东北部的气藏勘探力度。
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| 关 键 词： | 有效烃源岩 TOC下限 生烃潜力 丽水凹陷 东海盆地 |
| 收稿时间： | 2019-11-10 |
Definition and distribution prediction of effective source rocks in Lishui Sag,East China Sea Basin |
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| Shen Wenlong,Qi Binwen.Definition and distribution prediction of effective source rocks in Lishui Sag,East China Sea Basin[J].Bulletin of Geological Science and Technology,2020,39(3):77-88. |
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| Authors: | Shen Wenlong Qi Binwen |
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| Affiliation: | (CNOOC China Limited-Shanghai,Shanghai 200335,China) |
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| Abstract: | Lishui Sag, a sag with great exploration potential in the East China Sea Basin, has a low degree of exploration and few drilling results in recent years, so it is urgent to comprehensively evaluate its source rocks. Comprehensive evaluation of source rocks in Lishui Sag was carried out based on the Rock-Eval pyrolysis experiments. The results show that the kerogen type of the source rocks in the Sag is dominated by type Ⅲ, with a small amount of type Ⅱ1 and Ⅱ2 kerogen. Source rocks of Yueguifeng Formation are in mature to over mature stage.Most of the source rocks of Lingfeng Formation are in mature stage. While source rocks in Mingyuefeng Formation are dominantly in low maturity. According to the relationship between total organic carbon (TOC) content and pyrolysis parameter S1, the base limits TOC values of effective source rocks were determined to be 0.7% in Yueguifeng Formation, 1.0% in Lingfeng Formation and 0.9% in Mingyuefeng Formation. Biomarkers show that the source rocks in Lishui Sag are characterized by a mixed origin of organic matter in a transitional environment. Prediction of effective source rocks shows that the effective source rocks in Lishui Sag is locally distributed, and the northeast of West Sub-sag in Lishui Sag is the concentrated distribution area of effective source rocks. The hydrocarbon generation process of source rocks took place in the Paleocene, with a relatively short time (about 4.5 Ma). Source rocks of Yueguifeng Formation and Lingfeng Formation have great gas potential. The exploration of gas reservoirs in the northeast of the West sub-sag of Lishui Sag should be strengthened. |
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| Keywords: | effective source rock base limits of TOC content hydrocarbon potential Lishui Sag East China Sea Basin |
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