塔中Ⅰ号坡折带奥陶系裂缝方解石烃包裹体特征及成藏

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塔中Ⅰ号坡折带奥陶系中已发现的90%以上油气藏空间分布位置与断裂有关。据裂缝穿插关系、含烃包裹体情况,将塔中奥陶系缝隙按形成时间先后及与油气运移关系分成17种,按成因将17种缝隙分成成岩缝隙和构造裂缝,其中构造裂缝可进一步分成3期。据方解石脉中含烃包裹体情况将烃包裹体分成4期。对含不同期次烃包裹体的脉体进行碳氧锶同位素分析,表明方解石脉为深埋成岩期充填,含第Ⅰ期烃包裹体和含第Ⅲ期烃包裹体的方解石有深部寒武系重溶锶的混入,含第Ⅱ期烃包裹体和含第Ⅳ期烃包裹体的方解石主要受奥陶系围岩重溶锶的控制。在晚加里东—早海西期塔中Ⅰ号坡折带寒武系烃源岩排出的油气通过中奥陶统、上奥陶统灰岩是由下向上运移的,虽然有油通过但未储集。晚海西期,推断由北侧满加尔凹陷深部中奥陶统、下奥陶统烃源岩的油向南移动到塔中Ⅰ号坡折带浅部的奥陶系灰岩中储集,同时这一时期也有下部寒武系烃源岩排出的油和气进入中奥陶统、上奥陶统灰岩储层中。喜马拉雅期形成的第Ⅳ期烃包裹体在TZ26井、TZ24井和TZ62井最为常见,其北西边的井较少含有第Ⅳ期烃包裹体,油气可能由北西深部向南东浅部运移,经过了调整,而形成了现今油气藏。第Ⅲ期、第Ⅳ期烃包裹体对应的油气活动是形成大油气藏的关键。 The spatial distribution of more than 90% of the Ordovician discovered in Tazhong Ⅰ slope break zone is related to faults. According to the relationship between fracture interpenetration and hydrocarbon-bearing inclusions, the Ordovician slits in Tarim Basin are divided into 17 types according to their formation time and their relationship with hydrocarbon migration. According to their causes, 17 kinds of slits are divided into diagenetic and structural fractures, of which structural fractures can be further Divided into three. According to the hydrocarbon inclusions in calcite veins hydrocarbon inclusions will be divided into four phases. Carbonate-strontium isotope analyzes of veins with different periods of hydrocarbon inclusions indicate that calcite veins are filled during deep diagenetic periods. There are deep Cambrian systems with stage I hydrocarbon inclusions and stage III hydrocarbon inclusions Re-dissolved strontium incorporation, with the second phase of hydrocarbon inclusions and inclusions containing the fourth phase of calcite calcite mainly by the Ordovician rock around the strontium strontium control. During the Late Caledonian-Early Hercynian period, oil and gas from the Cambrian source rock in Tazhong Ⅰ slope break pass through the Middle Ordovician and the Upper Ordovician limestone migrated from below to above. Although oil passes Not stored. Late Hercynian, it was inferred that the oil from the Lower Middle Ordovician and Lower Ordovician source rocks in the Manjial Sag, northward, moved southward to the Ordovician limestone in the shallow part of Tazhong Ⅰ slope break, At the same time, oil and gas from Lower Cambrian source rocks also entered the Middle Ordovician and Upper Ordovician limestone reservoirs during this period. The fourth phase of hydrocarbon inclusions formed in the Himalayan period is most common in wells TZ26, TZ24 and TZ62. The wells in the northwestern margin contain less IV inclusions and hydrocarbons may migrate from the deep northwest to the shallow south and east, After adjustment, the formation of today’s oil and gas reservoir. The third and fourth phase of hydrocarbon inclusions correspond to the hydrocarbon activities are the key to the formation of large reservoirs.
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