渤海海域辽中凹陷LD油田油源断层运移能力定量评价及运移模式

doi:10.11743/ogg20180314

摘要/Abstract

摘要： 渤海海域辽中凹陷多个复杂断裂带内受次级调节正断层的控制形成了数量众多的断块圈闭，探井已经证实位于成熟烃源岩层系之上的断块圈闭其油源断层的垂向输导能力对不同断块的油气富集程度具有非常重要的影响。本文分析认为研究区油源断层的断面形态及其与成熟烃源岩段的接触面积是油气运移能力的主控因素，在此基础上，充分利用地震资料对油源断层进行精细解释，刻画断面三维形态展布及其与成熟烃源岩的接触，通过数值模拟方法定量计算了这两个地质因素控制下不同油源断层油气运移能力的大小，并结合测井资料对断层伴生裂缝带的发育特征进行了识别，建立了LD油田油气运移模式，研究结果表明：研究区内6条油源断层的油气运移能力存在明显差别；在整个油田范围内含油层段有24个油气充注点，且充注能力不同，控制了不同断块储量丰度的差异；油源断层伴生裂缝带的发育在断层两盘存在横向不对称性，在下降盘附近的裂缝更为发育，孔渗得到改善，从而导致这些充注点的油气在下降盘发生明显的分流作用。基于上述成果建立了研究区的油气运移模式，与实际钻探结果吻合较好。

关键词: 运移能力, 运移模式, 定量评价, 复杂断裂带, 油源断层, LD油田, 辽中凹陷

Abstract: In the Liaozhong sag,Bohai Sea,complex fault zones give rise to numerous secondary accommodation normal faults,which form and control a large number of fault block traps.Well data have confirmed that the vertical oil migration ability of source tapping faults,which connect mature source rocks with fault block traps located on top of it,is of great importance to abundance of oil and gas accumulation in these traps.The study regards that the geometry of source tapping fault's surface and its contact area within the mature source rocks control the oil and gas migration.Thus,the seismic data are used to elaborately interpret source tapping faults,to depict the three-dimensional geometry of fault section and its contact area within mature source rocks.Under the control of the above two geological factors,the migration ability was estimated by numerical simulation,and combined with logging data,we identified fault-associated fracture zones.Thus the model of oil and gas migration in LD oilfield is established based upon these results.The results are as follows:The oil migration ability of the six studied source tapping faults varies significantly.There are 24 charging points to the oil reservoir of the oilfield with diverse contributions,and result in different reserve abundance in different fault blocks.The intensity of associated fracture zone of the source tapping fault is different on either walls of the fault,with the better developed fractures and improved porosity and permeability near the downthrown side,where the selective hydrocarbon migration from the charging points occurs.And based on these results,we established the migration model of oil and gas in the study area,which matches well with the actual drilling results.

Key words: oil migration ability, migration model, quantitative evaluation, complex fault zone, oil source tapping fault, LD oilfield, Liaozhong sag

中图分类号:

TE122.1

田立新,王冰洁. 渤海海域辽中凹陷LD油田油源断层运移能力定量评价及运移模式[J]. 石油与天然气地质, 2018, 39(3): 567-577. doi: 10.11743/ogg20180314 Tian Lixin,Wang Bingjie. Quantitative evaluation of source tapping fault for oil migration and establishment of its migration model in LD oilfield in the Liaozhong Sag,Bohai Sea[J]. Oil & Gas Geology, 2018, 39(3): 567-577. doi: 10.11743/ogg20180314

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