轮古油田中部斜坡带奥陶系油气成藏特征研究
发布时间：2018-10-20 16:35
【摘要】：轮古油田中部斜坡带位于轮南低凸起,主要产油气层位为中下奥陶统鹰山组地层,是塔里木盆地勘探程度最高的区域之一。轮古油田奥陶系碳酸盐岩储层非均质性强,油气水分布关系复杂,局部出现油气水分异,且埋藏深,具多期次油气充注等特点。本文将以轮古中部斜坡带奥陶系油藏为主要研究对象,通过原油族组成、原油生物标志化合物、包裹体、储层沥青生物标志化合物等分析,对该地区的成藏特征进行研究,获得如下结论与认识： 1、中部斜坡带地区主要包括轮古7、轮古2和桑南西三大井区,整个区块位于轮南古潜山的隆起高部位,裂缝及岩溶十分发育。奥陶系碳酸盐岩储层中主要为油、气、水三者共存。轮古地区遭受强烈的风化剥蚀作用,导致轮古中部斜坡带奥陶系产层主要为奥陶系中下统的鹰山组地层。 2、中部斜坡带鹰山组储层岩石类型以泥晶灰岩为主,其次为粒屑灰岩。其储层基质为低孔、特低渗范畴,主要储集空间为构造及岩溶作用形成的次生溶蚀孔、缝和溶洞。 3、轮南地区主要发育有轮南西部地区哈拉哈塘凹陷的奥陶系烃源岩和轮南东部地区草湖凹陷的寒武系烃源岩。其中奥陶系烃源岩现今Ro值在1.2%～1.6%,进入了生油高峰时期,寒武系烃源岩现今1.6%～2.4%,进入生气阶段。 4、轮古油田奥陶系具有相同的油气来源,具有寒武系烃源岩和中～下奥陶统烃源岩混原油的特征,且至少存在三期油气的运移与充注,轮古7井区存在两期油气充注,轮古2井区和桑南西井区存在三期包充注,并且轮古7地区和桑南西地区第一期油的充注时期较早,且发生了较强烈的生物降解,后期油气充注的多少决定原油性质的好坏。 5、利用生物标志化合物参数判断轮古油田中部斜坡带油气运移的方向为两个方向,分别为南北向以及东西向充注过程
[Abstract]:The central slope zone of Lungu Oilfield is located in the low uplift of Lunnan, and the main oil-producing reservoir is the Yingshan formation of the Middle and Lower Ordovician, which is one of the highest exploration areas in the Tarim Basin. The Ordovician carbonate reservoir in Lungu Oilfield is characterized by strong heterogeneity, complex oil-gas-water distribution relationship, local oil and gas moisture variation, deep burial, multi-stage oil and gas filling and so on. This paper will take Ordovician reservoir in the central slope zone of Lungu as the main research object, through the analysis of crude oil family composition, crude oil biomarkers, inclusions, reservoir asphalt biomarker compounds, etc., to study the reservoir forming characteristics in this area. The main conclusions are as follows: 1. The central slope zone mainly includes three major well areas, Lungu 7, Lungu 2 and Sannanxi. The whole block is located in the high part of Lunnan buried hill, and the fractures and karst are well developed. In Ordovician carbonate reservoir, oil, gas and water coexist. The strong weathering and denudation in Lungu area resulted in the formation of Ordovician in the central slope zone of Luanggu mainly being Yingshan formation of middle and lower Ordovician. 2. The rock type of Yingshan formation reservoir in the middle slope zone of the central slope is mainly mudstone limestone. The next is granulite limestone. The reservoir matrix is low porosity and very low permeability, and the main reservoir space is secondary dissolution pore formed by structure and karstification. 3. There are Ordovician source rocks in the Harahatang Sag in the western part of Lunnan area and Cambrian source rocks in the Caohu Sag in the eastern part of Lunnan area. The present Ro value of the Ordovician source rocks is 1.2 ~ 1.6, which has entered the peak period of oil generation. The Cambrian source rocks are now 1.6 ~ 2.4 and enter the gas generation stage. 4. The Ordovician in Lungu Oilfield has the same source of oil and gas. It has the characteristics of Cambrian source rock and middle to lower Ordovician source rock mixed crude oil, and there are at least three stages of oil and gas migration and charging, two stages of oil and gas filling in Lungu 7 well area, three stages of oil and gas filling in Lungu 2 well area and Sannanxi well area. The filling period of the first stage oil in Lungu 7 area and Sangnanxi area was earlier, and the biodegradation occurred strongly. The quantity of oil and gas filling in the late stage determines the quality of crude oil. 5. Using the parameters of biomarker compounds to judge the migration direction of oil and gas in the middle slope zone of Lungu oilfield is two directions, namely, the filling process in the north-south direction and the east-west direction
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
本文编号：2283728
[Abstract]:The central slope zone of Lungu Oilfield is located in the low uplift of Lunnan, and the main oil-producing reservoir is the Yingshan formation of the Middle and Lower Ordovician, which is one of the highest exploration areas in the Tarim Basin. The Ordovician carbonate reservoir in Lungu Oilfield is characterized by strong heterogeneity, complex oil-gas-water distribution relationship, local oil and gas moisture variation, deep burial, multi-stage oil and gas filling and so on. This paper will take Ordovician reservoir in the central slope zone of Lungu as the main research object, through the analysis of crude oil family composition, crude oil biomarkers, inclusions, reservoir asphalt biomarker compounds, etc., to study the reservoir forming characteristics in this area. The main conclusions are as follows: 1. The central slope zone mainly includes three major well areas, Lungu 7, Lungu 2 and Sannanxi. The whole block is located in the high part of Lunnan buried hill, and the fractures and karst are well developed. In Ordovician carbonate reservoir, oil, gas and water coexist. The strong weathering and denudation in Lungu area resulted in the formation of Ordovician in the central slope zone of Luanggu mainly being Yingshan formation of middle and lower Ordovician. 2. The rock type of Yingshan formation reservoir in the middle slope zone of the central slope is mainly mudstone limestone. The next is granulite limestone. The reservoir matrix is low porosity and very low permeability, and the main reservoir space is secondary dissolution pore formed by structure and karstification. 3. There are Ordovician source rocks in the Harahatang Sag in the western part of Lunnan area and Cambrian source rocks in the Caohu Sag in the eastern part of Lunnan area. The present Ro value of the Ordovician source rocks is 1.2 ~ 1.6, which has entered the peak period of oil generation. The Cambrian source rocks are now 1.6 ~ 2.4 and enter the gas generation stage. 4. The Ordovician in Lungu Oilfield has the same source of oil and gas. It has the characteristics of Cambrian source rock and middle to lower Ordovician source rock mixed crude oil, and there are at least three stages of oil and gas migration and charging, two stages of oil and gas filling in Lungu 7 well area, three stages of oil and gas filling in Lungu 2 well area and Sannanxi well area. The filling period of the first stage oil in Lungu 7 area and Sangnanxi area was earlier, and the biodegradation occurred strongly. The quantity of oil and gas filling in the late stage determines the quality of crude oil. 5. Using the parameters of biomarker compounds to judge the migration direction of oil and gas in the middle slope zone of Lungu oilfield is two directions, namely, the filling process in the north-south direction and the east-west direction
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13
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