迈陈凹陷东部地区油气成藏及钻探目标研究
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摘要
迈陈凹陷位于北部湾盆地的中南部雷-琼坳陷区,其东部研究区面积约400km2。徐闻x1井的钻探获得了油气突破,展示了该区良好的勘探前景。但该区勘探程度低,地表条件复杂,地下断裂发育且具多期性、构造复杂,主要储集层流三段物性较差,储油层物性变化大,导致进一步勘探的难度较大。
本论文针对研究区油气勘探存在的问题,以油气综合评价为基础,以储层预测及解释技术为手段,开展油气成藏综合研究,全面系统地总结了研究区的构造格架、油气成藏模式及控制因素。同时,开展建立在解释地质模式基础上的复杂断块圈闭识别研究,落实复杂小断块圈闭,开展圈闭优选、精细描述评价工作,提供有利的勘探区带和钻探目标。
通过构造综合解释研究,整体解剖了研究区的构造展布特征,认为迈陈凹陷地层区域性北抬,主体部位近南北向剖面特征表现为南断北超,研究区内存在三个NNW走向的构造高带。沉积相研究和储盖组合分析认为,古近系流沙港组为最为有利的储盖组合,泥岩总厚度由SE向NW方向逐渐减薄,储层主要在研究区北部发育,物性由SE向NW方向逐渐变好,中部斜坡带是该成藏组合的有利勘探区带。研究认为,研究区以自生自储、近油源的油气运移模式为主;通过储层预测、烃源岩分布、保存条件、断裂发育及构造背景、局部圈闭发育落实等研究,综合评判出徐闻三维临深凹的内斜坡带西部地区是下步油气勘探的最有利区带,并落实3个有利的钻探目标。
Maichen Sag is located in Lei-Qiong depression region in the central south of Beibuwan Basin and the working area in the east is about 400km2. The success of Well X1 indicates that this area has great exploration potential. However, the lower exploration degree, complex surface conditions and subsurface structures, the development of multi-phase faults and strong physical property variation of oil-bearing layer make it difficult to explore further in the area.
For the main exploration problems, based on the comprehensive evaluation of hydrocarbon resources, this paper comprehensively and systematically sum up hydrocarbon reservoir-forming patterns, controlling factors and structure framework of this study area, using reservoir prediction and comprehensive seismic interpretation technique. In addition, we conduct the identification of complicated fault block traps, based on the structure interpretation mode, find out several small fault block traps, depict subtly and evaluate the traps. Thus, the favorable exploration belts and drilling targets are provided.
Based on the research on the structure comprehensive interpretation and the dissection on the structure distribution characteristics, we drew the following conclusions: Maichen sag was regionally uplift to the north, the main part is near south-north and its section displayed south-faulted and north-overlapped and there are three structural belts whose trend are NNW; Liusha guang formation is the most favorable reservoir-cap rocks assemble, the overall thickness of the mudstone is becoming thinner and thinner towards NW. The reservoirs developed mainly in the north, the porosity is between 11%-16% and the physical properties is becoming better and better from SE to NW. The central ramp region is the beneficial exploration belt of this pool-forming assemble. Utilizing the comprehensive research ,we thought, the mode of migration is dominated by self-generation , self-reservoiring and near oil sources. By means of using reservoir prediction ,preservation condition , prospection of reservoir and hydrocarbon source rock distribution and other study, we believed that the inner ramp region of three dimension near the deep sag is the most favorable belt. So we have determined three drilling targets and well locations.
本论文针对研究区油气勘探存在的问题,以油气综合评价为基础,以储层预测及解释技术为手段,开展油气成藏综合研究,全面系统地总结了研究区的构造格架、油气成藏模式及控制因素。同时,开展建立在解释地质模式基础上的复杂断块圈闭识别研究,落实复杂小断块圈闭,开展圈闭优选、精细描述评价工作,提供有利的勘探区带和钻探目标。
通过构造综合解释研究,整体解剖了研究区的构造展布特征,认为迈陈凹陷地层区域性北抬,主体部位近南北向剖面特征表现为南断北超,研究区内存在三个NNW走向的构造高带。沉积相研究和储盖组合分析认为,古近系流沙港组为最为有利的储盖组合,泥岩总厚度由SE向NW方向逐渐减薄,储层主要在研究区北部发育,物性由SE向NW方向逐渐变好,中部斜坡带是该成藏组合的有利勘探区带。研究认为,研究区以自生自储、近油源的油气运移模式为主;通过储层预测、烃源岩分布、保存条件、断裂发育及构造背景、局部圈闭发育落实等研究,综合评判出徐闻三维临深凹的内斜坡带西部地区是下步油气勘探的最有利区带,并落实3个有利的钻探目标。
Maichen Sag is located in Lei-Qiong depression region in the central south of Beibuwan Basin and the working area in the east is about 400km2. The success of Well X1 indicates that this area has great exploration potential. However, the lower exploration degree, complex surface conditions and subsurface structures, the development of multi-phase faults and strong physical property variation of oil-bearing layer make it difficult to explore further in the area.
For the main exploration problems, based on the comprehensive evaluation of hydrocarbon resources, this paper comprehensively and systematically sum up hydrocarbon reservoir-forming patterns, controlling factors and structure framework of this study area, using reservoir prediction and comprehensive seismic interpretation technique. In addition, we conduct the identification of complicated fault block traps, based on the structure interpretation mode, find out several small fault block traps, depict subtly and evaluate the traps. Thus, the favorable exploration belts and drilling targets are provided.
Based on the research on the structure comprehensive interpretation and the dissection on the structure distribution characteristics, we drew the following conclusions: Maichen sag was regionally uplift to the north, the main part is near south-north and its section displayed south-faulted and north-overlapped and there are three structural belts whose trend are NNW; Liusha guang formation is the most favorable reservoir-cap rocks assemble, the overall thickness of the mudstone is becoming thinner and thinner towards NW. The reservoirs developed mainly in the north, the porosity is between 11%-16% and the physical properties is becoming better and better from SE to NW. The central ramp region is the beneficial exploration belt of this pool-forming assemble. Utilizing the comprehensive research ,we thought, the mode of migration is dominated by self-generation , self-reservoiring and near oil sources. By means of using reservoir prediction ,preservation condition , prospection of reservoir and hydrocarbon source rock distribution and other study, we believed that the inner ramp region of three dimension near the deep sag is the most favorable belt. So we have determined three drilling targets and well locations.
引文
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